Module:Val/units/doc - Revision history

Quondum: ce

2025-05-05T16:59:00Z

← Previous revision		Revision as of 16:59, 5 May 2025
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	All unit entries that use SI will have the same base unit as the symbol at Val/units, but they will display properly at Val/list.		All unit entries that use SI will have the same base unit as the symbol at Val/units, but they will display properly at Val/list.

	For example, kilo is a thousand, but ~~you're~~ defining km2 for ~~kilometers~~ squared, ~~and~~ need HTML. ~~You~~ ~~can't~~ ~~use~~ SI with HTML, so use 1000*1000, or 1000000 in the sorting field. Use [[e notation\|1e-6]] or 0.000001 or 1/100000 instead.		For example, kilo is a thousand, but for defining km2 for kilometres squared will need HTML. SI cannot be used with HTML, so use 1000*1000, or 1000000 in the sorting field. Use [[e notation\|1e-6]] or 0.000001 or 1/100000 instead.

	If the unit you are maintaining has SI prefixes and they are all likely to be sorted in a table, add up to twelve entries, one for each common SI unit. Some of these, ~~like~~ ''~~Meter~~'' in the example, may have their own article, but usually all go to the base unit's pagename. Here is ~~how~~ ''~~meter~~'' is ~~defined~~.		If the unit you are maintaining has SI prefixes and they are all likely to be sorted in a table, add up to twelve entries, one for each common SI unit. Some of these, such as for ''metre'' in the example, may have their own article, but usually all go to the base unit's pagename. Here are the definitions for ''metre'' and some of it multiples.

	<pre>		<pre>
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	You can alias Convert or Val units. But these are different things.		You can alias Convert or Val units. But these are different things.
	* A "unit code alias" is when the same ''unit pagename and unit symbol'' are defined twice. If a different ''unit code'' is assigned to the same unit symbol and unit pagename, (say, as a copy of the previous entry) it will work as a Val alias.		* A "unit code alias" is when the same ''unit pagename and unit symbol'' are defined twice. If a different ''unit code'' is assigned to the same unit symbol and unit pagename, (say, as a copy of the previous entry) it will work as a Val alias.

	* A "unit alias" is when Val alias a Convert unit code. A unit of measurement is ''here'' denoted ALIAS to mean "they are defined ''there''". Val ''defaults'' to Convert, but it is good to be this explicit for certain Val units: the ones that may be tempting to define here, but that you don't want defined here because, says ALIAS, they are ''already'' defined there.		* A "unit alias" is when Val alias a Convert unit code. A unit of measurement is ''here'' denoted ALIAS to mean "they are defined ''there''". Val ''defaults'' to Convert, but it is good to be this explicit for certain Val units: the ones that may be tempting to define here, but that you don't want defined here because, says ALIAS, they are ''already'' defined there.
	* If your unit code is not listed at {{tl\|Val/list}}, you can check for it at {{tl\|Convert#Units}}		* If your unit code is not listed at {{tl\|Val/list}}, you can check for it at {{tl\|Convert#Units}}
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	* <code>ALIAS</code> specifies that the unit's symbol is the code for a unit defined in {{tlf\|convert}}}.		* <code>ALIAS</code> specifies that the unit's symbol is the code for a unit defined in {{tlf\|convert}}}.
	* <code>NOSPACE</code> prevents the default insertion of a non-breaking space before the unit symbol.		* <code>NOSPACE</code> prevents the default insertion of a non-breaking space before the unit symbol.
		⚫	* If you see the <code>ANGLE</code> flag, this identifies those special units that must displayed not only after the main Val number, but also after its [[uncertainty#Measurements]] numbers. (<code>ANGLE</code> also implies <code>NOSPACE</code>.)

⚫	* If you see the <code>ANGLE</code> flag, this identifies those special units that must displayed not only after the main Val number, but also after its [[uncertainty#Measurements]] numbers.(<code>ANGLE</code> also implies <code>NOSPACE</code>.)

	== Interaction with Convert ==		== Interaction with Convert ==
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	== Notes ==		== Notes ==
	{{~~refs~~}}		{{reflist}}

	== See also ==		== See also ==

Quondum: typographic; minor ce

2025-05-04T19:47:52Z

typographic; minor ce

Quondum: typographic tweaks and minor phrasing

2025-05-04T19:30:38Z

typographic tweaks and minor phrasing

Show changes

Quondum: /* Introduction */ we should not allow case-insensitive codes with this template, so rm suggestion that this might be legitimate, much less commonly applied

2025-05-04T18:51:03Z

Introduction: we should not allow case-insensitive codes with this template, so rm suggestion that this might be legitimate, much less commonly applied

← Previous revision		Revision as of 18:51, 4 May 2025
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	: The same unit/pagename/symbol, but by way of a different unit code.		: The same unit/pagename/symbol, but by way of a different unit code.
	: Unit code aliases are commonly applied for		: Unit code aliases are commonly applied for
	* capitalization, to make the unit code case insensitive.
	* per units, for example <code>m/s</code> and <code>m⋅s{{sup\|−1}}</code>.		* per units, for example <code>m/s</code> and <code>m⋅s{{sup\|−1}}</code>.
	* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ		* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ

Quondum: /* Introduction */ ordering of "m/s2 and m.s-2" within sentence

2025-05-04T18:43:49Z

Introduction: ordering of "m/s2 and m.s-2" within sentence

Paine Ellsworth: High-use template

2025-02-08T18:33:15Z

High-use template

← Previous revision		Revision as of 18:33, 8 February 2025
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	~~{{#ifeq:{{SUBPAGENAME}}\|sandbox\|\|~~{{High-use}}}}		{{High-use}}

	The list of Val units is published at [[Template:Val/list]], and here is the place that produces that report. So preview {{tl\|Val/list}} from the edit box to see your changes before saving them. The file format and syntax are mostly self explanatory.		The list of Val units is published at [[Template:Val/list]], and here is the place that produces that report. So preview {{tl\|Val/list}} from the edit box to see your changes before saving them. The file format and syntax are mostly self explanatory.

Cedar101: /* Introduction */ {{elc}}


2024-12-02T23:51:46Z
Introduction:  {{elc}} <code>

				
				
				
				
				
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  An entry defining a [[Unit of measurement|unit]] for Val is a single line under a [[Wikipedia:section|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink|link]].  If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.  
  
  An entry defining a [[Unit of measurement|unit]] for Val is a single line under a [[Wikipedia:section|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink|link]].  If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.  


  
  

  
  



  
  :<kbd>''code''{{spaces|4}}[<nowiki/>[ ''pagename'' | ''symbol'' ]]</kbd>
  
  :<code>''code''{{spaces|4}}[<nowiki/>[ ''pagename'' | ''symbol'' ]]</code>


  
  

  
  



  
  ;unit code
  
  ;unit code


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  * Unit codes will be case sensitive.
  
  * Unit codes will be case sensitive.


  
  * Prefer {{code|u}} for the Greek letter &mu;, if you're not sure.
  
  * Prefer {{code|u}} for the Greek letter &mu;, if you're not sure.


  
  * Composite units have [[Dimensional analysis#Definition|dimensions]] that multiply, divide, and apply powers to component units.  Use {{code|.}} to multiply, {{code|/}} to divide, and a signed digit for powers.  For multiplication, {{code|*}} is deprecated.  When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code|m/s2}} and {{code|m.s-2}} (for <kbd>m/s<sup>2</sup></kbd> and <kbd>m&sdot;s<sup>−2</sup></kbd>).
  
  * Composite units have [[Dimensional analysis#Definition|dimensions]] that multiply, divide, and apply powers to component units.  Use {{code|.}} to multiply, {{code|/}} to divide, and a signed digit for powers.  For multiplication, {{code|*}} is deprecated.  When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code|m/s2}} and {{code|m.s-2}} (for <code>m/s<sup>2</sup></code> and <code>m&sdot;s<sup>−2</sup></code>).


  
  

  
  



  
  ;unit pagename
  
  ;unit pagename


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  :[[wp:V|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].
  
  :[[wp:V|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].


  
  * Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting|Wikipedia HTML formatting]] is accepted.
  
  * Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting|Wikipedia HTML formatting]] is accepted.


  
  * Composite units use {{code|&sdot;}} to multiply, {{code|/}} to divide, and {{tag|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <kbd>m/s<sup>2</sup></kbd> and <kbd>m&sdot;s<sup>−2</sup></kbd> (from {{code|m.s-2}} and {{code|m/s2}}).
  
  * Composite units use {{code|&sdot;}} to multiply, {{code|/}} to divide, and {{tag|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <code>m/s<sup>2</sup></code> and <code>m&sdot;s<sup>−2</sup></code> (from {{code|m.s-2}} and {{code|m/s2}}).


  
  * If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag|abbr}} or {{tag|span}}.
  
  * If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag|abbr}} or {{tag|span}}.


  
  * For more about HTML tags and HTML symbols such as {{code|&sdot;}}, see [[Wikipedia:HTML]]. 
  
  * For more about HTML tags and HTML symbols such as {{code|&sdot;}}, see [[Wikipedia:HTML]]. 


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  :Unit code aliases are commonly applied for
  
  :Unit code aliases are commonly applied for


  
  * capitalization, to make the unit code case insensitive.
  
  * capitalization, to make the unit code case insensitive.


  
  * per units, for example <kbd>m/s</kbd> and <kbd>m⋅s{{sup|−1}}</kbd>.
  
  * per units, for example <code>m/s</code> and <code>m⋅s{{sup|−1}}</code>.


  
  * Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix &mu;
  
  * Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix &mu;


  
  

  
  



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  : A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).
  
  : A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).


  
  

  
  



  
  The preview of main interest is <kbd>Template:Val/list</kbd><ref>The special relation between Val/units and Val/list is that the wikitext of Val/list is always generated by Val/units when that page is viewed, ''so'' when you '''preview page with this module''', Val/list is generated using the contents of the edit box of Val/units.</ref>, but previewing other your own page of interest with your newly added unit in a val call and in a sorting table are also part of this procedure.
  
  The preview of main interest is {{elc|Template:Val/list}}<ref>The special relation between Val/units and Val/list is that the wikitext of Val/list is always generated by Val/units when that page is viewed, ''so'' when you '''preview page with this module''', Val/list is generated using the contents of the edit box of Val/units.</ref>, but previewing other your own page of interest with your newly added unit in a val call and in a sorting table are also part of this procedure.


  
  

  
  



  
  == How to add a unit ==
  
  == How to add a unit ==



Cedar101: /* SI flag */ {{tlx}}
2024-12-02T23:48:14Z
SI flag:  {{tlx}}

				
				
				
				
				
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  :<code>µV&nbsp;&nbsp;&nbsp;V&nbsp;&nbsp;&nbsp;Microvolt&nbsp;&nbsp;&nbsp;SI</code>
  
  :<code>µV&nbsp;&nbsp;&nbsp;V&nbsp;&nbsp;&nbsp;Microvolt&nbsp;&nbsp;&nbsp;SI</code>


  
  :<code>uV&nbsp;&nbsp;&nbsp;V&nbsp;&nbsp;&nbsp;Microvolt&nbsp;&nbsp;&nbsp;SI</code>
  
  :<code>uV&nbsp;&nbsp;&nbsp;V&nbsp;&nbsp;&nbsp;Microvolt&nbsp;&nbsp;&nbsp;SI</code>


  
  Now <nowiki>{{val|1|u=kV}}</nowiki> will sort after <nowiki>{{val|999|u=V}}</nowiki> without having to resort to using a number, and with the clean representation at Val/list.
  
  Now {{tlx|val|1|u{{=}}kV}} will sort after {{tlx|val|999|u{{=}}V}} without having to resort to using a number, and with the clean representation at Val/list.


  
  

  
  



  
  The symbol column shows "V" for each, but it is not the symbol—it is the base unit after removing the SI prefix so convert can work out what is intended to be the prefix. The following would give identical results:
  
  The symbol column shows "V" for each, but it is not the symbol—it is the base unit after removing the SI prefix so convert can work out what is intended to be the prefix. The following would give identical results:




Cedar101: /* Scale */ {{tlx}}
2024-12-02T23:46:42Z
Scale:  {{tlx}}

				
				
				
				
				
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  There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit.  In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it's not that simple, then the unit system's number has associated a number to it, such as Avogadro's number.  
  
  There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit.  In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it's not that simple, then the unit system's number has associated a number to it, such as Avogadro's number.  


  
  

  
  



  
  For example, the following defines a unit with code <kbd>billion</kbd>, symbol <kbd>billion</kbd>, link [[1,000,000,000]], and scale <kbd>1e9</kbd> ({{val|1|e=9}}).  After the following entry is saved to the database
  
  For example, the following defines a unit with code <code>billion</code>, symbol <code>billion</code>, link [[1,000,000,000]], and scale <code>1e9</code> ({{val|1|e=9}}).  After the following entry is saved to the database


  
  <pre>
  
  <pre>


  
  billion            billion          1,000,000,000          1e9
  
  billion            billion          1,000,000,000          1e9


  
  </pre>
  
  </pre>


  
  <nowiki>{{val|2|u=billion}}</nowiki> would start sorting after <nowiki>{{val|98.7|e=3}}</nowiki>.
  
  {{tlx|val|2|u{{=}}billion}} would start sorting after {{tlx|val|98.7|e{{=}}3}}.


  
  

  
  



  
  ==== SI flag ====
  
  ==== SI flag ====




Cedar101: /* Testing a new unit */ syntaxhighlight
2024-12-02T23:43:34Z
Testing a new unit:  syntaxhighlight

				
				
				
				
				
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  To test a ''newly added'' unit not used on any page, you will need to run the preview on a sandbox page you have already created. Here are all the test cases you can preview there before saving your changes here; they are the four {{para|u}} parameters:
  
  To test a ''newly added'' unit not used on any page, you will need to run the preview on a sandbox page you have already created. Here are all the test cases you can preview there before saving your changes here; they are the four {{para|u}} parameters:


  
  
  <syntaxhighlight lang="wikitext">


  
  <pre>
  


  
  {{Val|9|u =            }}
  
  {{Val|9|u =            }}


  
  {{Val|9|ul =           }}
  
  {{Val|9|ul =           }}


  
  {{Val|9|u=foo|up =     }}
  
  {{Val|9|u=foo|up =     }}


  
  {{Val|9|u=foo|upl =    }}
  
  {{Val|9|u=foo|upl =    }}


  
  
  </syntaxhighlight>


  
  </pre>
  


  
  

  
  



  
  and the [[Help:Table#Sortable_tables|sortable table]]:
  
  and the [[Help:Table#Sortable_tables|sortable table]]:


  
  

  
  



  
  
  <syntaxhighlight lang="wikitext">


  
  <pre>
  


  
  {| class="wikitable sortable" summary="Sortable table to test Val sorting"
  
  {| class="wikitable sortable" summary="Sortable table to test Val sorting"


  
  ! Val number and unit
  
  ! Val number and unit


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  | {{val|4|u=      }} 
  
  | {{val|4|u=      }} 


  
  |}
  
  |}


  
  
  </syntaxhighlight>


  
  </pre>
  


  
  

  
  



  
  This table falls into place unsorted, so when your unit accepts an [[SI prefix]] you can test, say, k, m, and G, with your unit, and compare with e notations 1e3, 1e6, and 1e9 in the number.  For example, Val sorts these two as equal: <code>1e3 m</code> (standard [[scientific notation#E notation|e notation]]) and <code>1 km</code>.
  
  This table falls into place unsorted, so when your unit accepts an [[SI prefix]] you can test, say, k, m, and G, with your unit, and compare with e notations 1e3, 1e6, and 1e9 in the number.  For example, Val sorts these two as equal: <code>1e3 m</code> (standard [[scientific notation#E notation|e notation]]) and <code>1 km</code>.

← Previous revision		Revision as of 19:47, 4 May 2025
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	Questions or requests related to Val units are welcomed at [[Template talk:Val]]. For feedback specifically about the terminology or procedural steps seen on this page, please use the talk page.		Questions or requests related to Val units are welcomed at [[Template talk:Val]]. For feedback specifically about the terminology or procedural steps seen on this page, please use the talk page.

	Below are the detailed procedures, examples, descriptions of testing and previewing, explanations about sorting Val expressions, and links to helpful pages. There's also further information about Val/Convert relations.		Below are the detailed procedures, examples, descriptions of testing and previewing, explanations about sorting Val expressions, and links to helpful pages. There is also further information about Val/Convert relations.

	== Introduction ==		== Introduction ==
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	: [[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].		: [[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].
	* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.		* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.
	* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for ~~<code>~~m/s<sup>2</sup~~></code~~> and ~~<code>~~m⋅s<sup>−2</sup~~></code~~> (from {{code\|m/s2}} and {{code\|m.s-2}}).		* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for m/s<sup>2</sup> and m⋅s<sup>−2</sup> (from {{code\|m/s2}} and {{code\|m.s-2}}).
	* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.		* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.
	* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].		* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].
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	To maintain Val units,		To maintain Val units,
	# {{edit\|Module:Val/units\|Edit Module:Val/units}} and make your changes.		# {{edit\|Module:Val/units\|Edit Module:Val/units}} and make your changes.
	# Preview {{space}} <kbd>~~{{big\|~~Template:Val/list}}</kbd> ~~{{space}}~~ .		# Preview {{space}} <kbd>Template:Val/list</kbd>.
	#* Look for any messages. An "Invalid definition" message is available automatically.		#* Look for any messages. An "Invalid definition" message is available automatically.
	#* [[Wikipedia:TESTLINK\|Prove the intended link]] from the preview.		#* [[Wikipedia:TESTLINK\|Prove the intended link]] from the preview.
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	If you want a unit to add for practice, add one from [[List of common physics notations]], or from [[SI units#Units and prefixes]].		If you want a unit to add for practice, add one from [[List of common physics notations]], or from [[SI units#Units and prefixes]].

	'''Changing or removing existing unit codes''' is possible by employing {{tl\|Template usage\|Val\|''code''}} to see how Val unit codes may or may not be in use on the wiki. For example, to see about changing or removing unit code <~~kbd~~>J.s</~~kbd~~>, do a		'''Changing or removing existing unit codes''' is possible by employing {{tl\|Template usage\|Val\|''code''}} to see how Val unit codes may or may not be in use on the wiki. For example, to see about changing or removing unit code <code>J.s</code>, do a
	: {{#invoke:DemoTemplate\|tlusage\|val\|"J.s"\|0}}.		: {{#invoke:DemoTemplate\|tlusage\|val\|"J.s"\|0}}.
	Put any unit code in quotes if it contains dash, dot, or slash{{mdash}}anything but a letter or number.		Put any unit code in quotes if it contains dash, dot, or slash{{mdash}}anything but a letter or number.

	=== Examples ===		=== Examples ===
	Say you're creating a new page or revamping an old page, and discover the need for a convenient way to make several entries containing [[Speed of light\|<span title="speed of light in vacuum">''c''<sub>0</sub></span>]], and link that symbol to the page ''Speed of light''. The following entry will define your unit code as <~~kbd~~>c0</~~kbd~~>, your unit symbol as <~~kbd~~><nowiki>''c''<sub>0</sub></nowiki></~~kbd~~>, and the unit's article as ''[[Speed of light#Numerical value, notation, and units]]''.		Say you're creating a new page or revamping an old page, and discover the need for a convenient way to make several entries containing [[Speed of light\|<span title="speed of light in vacuum">''c''<sub>0</sub></span>]], and link that symbol to the page ''Speed of light''. The following entry will define your unit code as <code>c0</code>, your unit symbol as <code><nowiki>''c''<sub>0</sub></nowiki></code>, and the unit's article as ''[[Speed of light#Numerical value, notation, and units]]''.

	: <~~kbd~~>c0{{spaces\|2}}'''{{big\|1= [[ }}'''Speed of light#Numerical value, notation, and unit symbol'''{{big\|{{!}}}}'''<nowiki>''c''<sub>0</sub></nowiki>'''{{big\|]]}}'''</~~kbd~~>		: <code>c0{{spaces\|2}}'''{{big\|1=[[}}'''Speed of light#Numerical value, notation, and unit symbol'''{{big\|{{!}}}}'''<nowiki>''c''<sub>0</sub></nowiki>'''{{big\|]]}}'''</code>
	or as explained below at [[#Advanced unit entry formats\|§ Advanced unit entry formats]], you can also write		or as explained below at [[#Advanced unit entry formats\|§ Advanced unit entry formats]], you can also write
	: <~~kbd~~>c0{{spaces\|2}}<nowiki>''c''<sub>0</sub></nowiki>{{spaces\|6}}Speed of light#Numerical value, notation, and units</~~kbd~~>		: <code>c0{{spaces\|2}}<nowiki>''c''<sub>0</sub></nowiki>{{spaces\|6}}Speed of light#Numerical value, notation, and units</code>

	Then preview with ''Template:Val/list'', and check for an error message next to the new unit, and test the link you gave.		Then preview with ''Template:Val/list'', and check for an error message next to the new unit, and test the link you gave.

	After that the page with the (saved) Val calls is used to test the linked and non-linked versions of the normal and the per units:		After that the page with the (saved) Val calls is used to test the linked and non-linked versions of the normal and the per units:
	* <~~kbd~~><nowiki>{{val\|0.891\|u=c0}}</nowiki></~~kbd~~> → {{val\|0.891\|u=c0}}		* <code><nowiki>{{val\|0.891\|u=c0}}</nowiki></code> → {{val\|0.891\|u=c0}}
	* <~~kbd~~><nowiki>{{val\|0.891\|ul=c0}}</nowiki></~~kbd~~> → {{val\|0.891\|ul=c0}}		* <code><nowiki>{{val\|0.891\|ul=c0}}</nowiki></code> → {{val\|0.891\|ul=c0}}
	* <~~kbd~~><nowiki>{{val\|0.891\|up=c0}}</nowiki></~~kbd~~> → {{val\|0.891\|up=c0}}		* <code><nowiki>{{val\|0.891\|up=c0}}</nowiki></code> → {{val\|0.891\|up=c0}}
	* <~~kbd~~><nowiki>{{val\|0.891\|upl=c0}}</nowiki></~~kbd~~> → {{val\|0.891\|upl=c0}}		* <code><nowiki>{{val\|0.891\|upl=c0}}</nowiki></code> → {{val\|0.891\|upl=c0}}

	For an entire example that uses the other format to make a Val/unit entry.		For an entire example that uses the other format to make a Val/unit entry.
	# Put this in a sandbox: <~~kbd~~>{<nowiki/>{val\|1.23\|ul='''tins'''}}</~~kbd~~> → {{val\|1.23\|ul=tins}}		# Put this in a sandbox: <code>{<nowiki/>{val\|1.23\|ul='''tins'''}}</code> → {{val\|1.23\|ul=tins}}
	# Edit [[Module:Val/units]] and insert a line like the following (do not save yet):		# Edit [[Module:Val/units]] and insert a line like the following (do not save yet):
	#: <~~kbd~~>'''tins'''{{spaces\|3}}'''tins'''{{spaces\|3}}Contins unities</~~kbd~~>		#: <code>'''tins'''{{spaces\|3}}'''tins'''{{spaces\|3}}Contins unities</code>
	# Under "Preview page with this module" enter <kbd>Template:Val/list</kbd>, and click ''Show preview''. It shows Val/list through the version of Val/units in the edit box. Say there are no errors, the markup and hover-text look good, and the link navigates to the unit's page.		# Under "Preview page with this module" enter <kbd>Template:Val/list</kbd>, and click ''Show preview''. It shows Val/list through the version of Val/units in the edit box. Say there are no errors, the markup and hover-text look good, and the link navigates to the unit's page.
	# Then in the same way of previewing, put the [[wp:pagename\|fullpagename]] of the sandbox from step 1, and click ''Show preview''.		# Then in the same way of previewing, put the [[wp:pagename\|fullpagename]] of the sandbox from step 1, and click ''Show preview''.
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	Where [[Help:Sorting\|Sorting]] is done on the wiki, it is done in [[Help:table#Sortable tables\|sortable tables]].		Where [[Help:Sorting\|Sorting]] is done on the wiki, it is done in [[Help:table#Sortable tables\|sortable tables]].
	Val entries in a sortable table will need a fourth field sorting flag. It can be a number, an equation, or an <~~kbd~~>SI</~~kbd~~>, but it flags the same function: a wikitable sorting "scale".		Val entries in a sortable table will need a fourth field sorting flag. It can be a number, an equation, or <code>SI</code>, but it flags the same function: a wikitable sorting "scale".

	To display the sort key use {{para\|debug\|yes}}. For example		To display the sort key use {{para\|debug\|yes}}. For example
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	For scaling a unit to sort properly, you need to pick a number for a sorting factor.		For scaling a unit to sort properly, you need to pick a number for a sorting factor.
	There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit. In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it's not that simple, then the unit system's number has associated a number to it, such as Avogadro's number.		There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit. In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it is not that simple, then the unit system's number has associated a number to it, such as the Avogadro number.

	For example, the following defines a unit with code <code>billion</code>, symbol <code>billion</code>, link [[1,000,000,000]], and scale <code>1e9</code> ({{val\|1\|e=9}}). After the following entry is saved to the database		For example, the following defines a unit with code <code>billion</code>, symbol <code>billion</code>, link [[1,000,000,000]], and scale <code>1e9</code> ({{val\|1\|e=9}}). After the following entry is saved to the database
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	* A "unit code alias" is when the same ''unit pagename and unit symbol'' are defined twice. If a different ''unit code'' is assigned to the same unit symbol and unit pagename, (say, as a copy of the previous entry) it will work as a Val alias.		* A "unit code alias" is when the same ''unit pagename and unit symbol'' are defined twice. If a different ''unit code'' is assigned to the same unit symbol and unit pagename, (say, as a copy of the previous entry) it will work as a Val alias.

	* A "unit alias" is when Val alias a Convert unit code. A unit of measurement is ''here'' denoted ALIAS to mean "they are defined ''there''". Val ''defaults'' to Convert, but it's good to this explicit for certain Val units: the ones tempting to define here, but that you don't want defined here because, says ALIAS, they are ''already'' defined there.		* A "unit alias" is when Val alias a Convert unit code. A unit of measurement is ''here'' denoted ALIAS to mean "they are defined ''there''". Val ''defaults'' to Convert, but it is good to be this explicit for certain Val units: the ones that may be tempting to define here, but that you don't want defined here because, says ALIAS, they are ''already'' defined there.
	* If your unit code is not listed at {{tl\|Val/list}}, you can check for it at {{tl\|Convert#Units}}		* If your unit code is not listed at {{tl\|Val/list}}, you can check for it at {{tl\|Convert#Units}}

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	Val and Convert share unit codes, but their units of measurement are different.		Val and Convert share unit codes, but their units of measurement are different.
	* Most of the wiki's unit codes are managed by {{tl\|Convert}}.		* Most of the wiki's unit codes are managed by {{tl\|Convert}}.
	* Some very few unit codes here, like C and F, mean something different there. Val caters to Coulombs and Farads, while Convert caters to Celsius and Fahrenheit. Convert and Val ''unit codes'' are mostly identical, like they are for <~~kbd~~>degC</~~kbd~~> and for <~~kbd~~>degF</~~kbd~~>.		* Some very few unit codes here, like C and F, mean something different there. Val caters to Coulombs and Farads, while Convert caters to Celsius and Fahrenheit. Convert and Val ''unit codes'' are mostly identical, like they are for <code>degC</code> and for <code>degF</code>.
	* Val could need ''any'' unit, while not all units are needed in conversions, so Val needs ''all'' of Convert's units and some of its own.		* Val could need ''any'' unit, while not all units are needed in conversions, so Val needs ''all'' of Convert's units and some of its own.
	* Sorting functionality is handled for Val by {{tlf\|convert}}.)		* Sorting functionality is handled for Val by {{tlf\|convert}}.)

← Previous revision		Revision as of 18:43, 4 May 2025
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	An entry defining a [[Unit of measurement\|unit]] for Val is a single line under a [[Wikipedia:section\|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink\|link]]. If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.		An entry defining a [[Unit of measurement\|unit]] for Val is a single line under a [[Wikipedia:section\|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink\|link]]. If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.

	:<code>''code''{{spaces\|4}}[<nowiki/>[ ''pagename'' \| ''symbol'' ]]</code>		: <code>''code''{{spaces\|4}}[<nowiki/>[ ''pagename'' \| ''symbol'' ]]</code>

	;unit code		; unit code
	: The keyboard typeable name of the symbol that users give Val's {{para\|u}}, {{para\|ul}}, {{para\|up}} or {{para\|upl}} parameters.		: The keyboard typeable name of the symbol that users give Val's {{para\|u}}, {{para\|ul}}, {{para\|up}} or {{para\|upl}} parameters.
	* Unit codes will be case sensitive.		* Unit codes will be case sensitive.
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	* Composite units have [[Dimensional analysis#Definition\|dimensions]] that multiply, divide, and apply powers to component units. Use {{code\|.}} to multiply, {{code\|/}} to divide, and a signed digit for powers. For multiplication, {{code\|*}} is deprecated. When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code\|m/s2}} and {{code\|m.s-2}} (for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code>).		* Composite units have [[Dimensional analysis#Definition\|dimensions]] that multiply, divide, and apply powers to component units. Use {{code\|.}} to multiply, {{code\|/}} to divide, and a signed digit for powers. For multiplication, {{code\|*}} is deprecated. When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code\|m/s2}} and {{code\|m.s-2}} (for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code>).

	;unit pagename		; unit pagename
	:Title or section of an article. When linked with ul or upl, the title or one of its [[WP:redirect\|redirect]]s can expand the abbreviation for the unit.<ref>A redirect page is easy to make; there are tools on the editor toolbars.</ref>		: Title or section of an article. When linked with ul or upl, the title or one of its [[WP:redirect\|redirect]]s can expand the abbreviation for the unit.<ref>A redirect page is easy to make; there are tools on the editor toolbars.</ref>

	;unit symbol		; unit symbol
	:[[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].		: [[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].
	* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.		* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.
	* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code> (from {{code\|m~~.s-2~~}} and {{code\|m~~/s2~~}}).		* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code> (from {{code\|m/s2}} and {{code\|m.s-2}}).
	* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.		* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.
	* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].		* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].
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	* Examples of unit codes, and hover text are at [[Template:Val/list]].		* Examples of unit codes, and hover text are at [[Template:Val/list]].

	;unit code alias		; unit code alias
	: The same unit/pagename/symbol, but by way of a different unit code.		: The same unit/pagename/symbol, but by way of a different unit code.
	:Unit code aliases are commonly applied for		: Unit code aliases are commonly applied for
	* capitalization, to make the unit code case insensitive.		* capitalization, to make the unit code case insensitive.
	* per units, for example <code>m/s</code> and <code>m⋅s{{sup\|−1}}</code>.		* per units, for example <code>m/s</code> and <code>m⋅s{{sup\|−1}}</code>.
	* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ		* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ

	;Preview page with this template/module		; Preview page with this template/module
	: A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).		: A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).

← Previous revision		Revision as of 23:51, 2 December 2024
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	An entry defining a [[Unit of measurement\|unit]] for Val is a single line under a [[Wikipedia:section\|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink\|link]]. If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.		An entry defining a [[Unit of measurement\|unit]] for Val is a single line under a [[Wikipedia:section\|section]] heading.<ref>Module pages don't have section editing.</ref> It starts with the '''unit code''', followed by at least two spaces and a [[WP:wikilink\|link]]. If you are adding a group of related units, you can enter a blank line around them to group them in the report at Val/list. An entry is ignored if it lacks at least ''two adjacent space characters''.

	:<~~kbd~~>''code''{{spaces\|4}}[<nowiki/>[ ''pagename'' \| ''symbol'' ]]</~~kbd~~>		:<code>''code''{{spaces\|4}}[<nowiki/>[ ''pagename'' \| ''symbol'' ]]</code>

	;unit code		;unit code
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	* Unit codes will be case sensitive.		* Unit codes will be case sensitive.
	* Prefer {{code\|u}} for the Greek letter μ, if you're not sure.		* Prefer {{code\|u}} for the Greek letter μ, if you're not sure.
	* Composite units have [[Dimensional analysis#Definition\|dimensions]] that multiply, divide, and apply powers to component units. Use {{code\|.}} to multiply, {{code\|/}} to divide, and a signed digit for powers. For multiplication, {{code\|*}} is deprecated. When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code\|m/s2}} and {{code\|m.s-2}} (for <~~kbd~~>m/s<sup>2</sup></~~kbd~~> and <~~kbd~~>m⋅s<sup>−2</sup></~~kbd~~>).		* Composite units have [[Dimensional analysis#Definition\|dimensions]] that multiply, divide, and apply powers to component units. Use {{code\|.}} to multiply, {{code\|/}} to divide, and a signed digit for powers. For multiplication, {{code\|*}} is deprecated. When adding a unit that includes division, consider also adding a version with multiplication by the negated power; for example, {{code\|m/s2}} and {{code\|m.s-2}} (for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code>).

	;unit pagename		;unit pagename
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	:[[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].		:[[wp:V\|Verifiable]], standard symbol, formatted in accordance with [[WP:UNITS]].
	* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.		* Templates will not work for producing the unit symbol for input to this module; only [[Wikipedia:HTML#Formatting\|Wikipedia HTML formatting]] is accepted.
	* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <~~kbd~~>m/s<sup>2</sup></~~kbd~~> and <~~kbd~~>m⋅s<sup>−2</sup></~~kbd~~> (from {{code\|m.s-2}} and {{code\|m/s2}}).		* Composite units use {{code\|⋅}} to multiply, {{code\|/}} to divide, and {{tag\|sup}} for powers. Division is also the unit-inversion form that multiplies a negative numbered power, for example for <code>m/s<sup>2</sup></code> and <code>m⋅s<sup>−2</sup></code> (from {{code\|m.s-2}} and {{code\|m/s2}}).
	* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.		* If the hover-text just shows the abbreviation, it is not a user-friendly unit-symbol. When not linked, the unit's abbreviation can be spelled out with hover-text at the symbol by way of the ''title'' attribute of either {{tag\|abbr}} or {{tag\|span}}.
	* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].		* For more about HTML tags and HTML symbols such as {{code\|⋅}}, see [[Wikipedia:HTML]].
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	:Unit code aliases are commonly applied for		:Unit code aliases are commonly applied for
	* capitalization, to make the unit code case insensitive.		* capitalization, to make the unit code case insensitive.
	* per units, for example <~~kbd~~>m/s</~~kbd~~> and <~~kbd~~>m⋅s{{sup\|−1}}</~~kbd~~>.		* per units, for example <code>m/s</code> and <code>m⋅s{{sup\|−1}}</code>.
	* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ		* Greek letters, to allow for both US keyboard and Greek-character-input applications, for example the SI prefix μ

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	: A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).		: A feature, similar to a sandbox and testcases, that provides a preview of how the code currently in the edit box (sandbox) will look when applied to any page (testcases).

	The preview of main interest is ~~<kbd>~~Template:Val/list~~</kbd>~~<ref>The special relation between Val/units and Val/list is that the wikitext of Val/list is always generated by Val/units when that page is viewed, ''so'' when you '''preview page with this module''', Val/list is generated using the contents of the edit box of Val/units.</ref>, but previewing other your own page of interest with your newly added unit in a val call and in a sorting table are also part of this procedure.		The preview of main interest is {{elc\|Template:Val/list}}<ref>The special relation between Val/units and Val/list is that the wikitext of Val/list is always generated by Val/units when that page is viewed, ''so'' when you '''preview page with this module''', Val/list is generated using the contents of the edit box of Val/units.</ref>, but previewing other your own page of interest with your newly added unit in a val call and in a sorting table are also part of this procedure.

	== How to add a unit ==		== How to add a unit ==

← Previous revision		Revision as of 23:48, 2 December 2024
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	:<code>µV   V   Microvolt   SI</code>		:<code>µV   V   Microvolt   SI</code>
	:<code>uV   V   Microvolt   SI</code>		:<code>uV   V   Microvolt   SI</code>
	Now ~~<nowiki>~~{{val\|1\|u=kV}}~~</nowiki>~~ will sort after ~~<nowiki>~~{{val\|999\|u=V}}~~</nowiki>~~ without having to resort to using a number, and with the clean representation at Val/list.		Now {{tlx\|val\|1\|u{{=}}kV}} will sort after {{tlx\|val\|999\|u{{=}}V}} without having to resort to using a number, and with the clean representation at Val/list.

	The symbol column shows "V" for each, but it is not the symbol—it is the base unit after removing the SI prefix so convert can work out what is intended to be the prefix. The following would give identical results:		The symbol column shows "V" for each, but it is not the symbol—it is the base unit after removing the SI prefix so convert can work out what is intended to be the prefix. The following would give identical results:

← Previous revision		Revision as of 23:46, 2 December 2024
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	There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit. In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it's not that simple, then the unit system's number has associated a number to it, such as Avogadro's number.		There are numerous examples at [[Template:Val/list]]. A [[system of units]] will have its base units, for example 1 bit; then the scale for sorting a kilobyte unit is then 8000 (eight bits per byte, times a kilo, or thousand). Or a year scale is seconds so that all ''times'' sort by seconds, which is a base unit. In general the scale shows to be "base unit" of the same type times the "SI prefix", and if it's not that simple, then the unit system's number has associated a number to it, such as Avogadro's number.

	For example, the following defines a unit with code <~~kbd~~>billion</~~kbd~~>, symbol <~~kbd~~>billion</~~kbd~~>, link [[1,000,000,000]], and scale <~~kbd~~>1e9</~~kbd~~> ({{val\|1\|e=9}}). After the following entry is saved to the database		For example, the following defines a unit with code <code>billion</code>, symbol <code>billion</code>, link [[1,000,000,000]], and scale <code>1e9</code> ({{val\|1\|e=9}}). After the following entry is saved to the database
	<pre>		<pre>
	billion billion 1,000,000,000 1e9		billion billion 1,000,000,000 1e9
	</pre>		</pre>
	~~<nowiki>~~{{val\|2\|u=billion}}~~</nowiki>~~ would start sorting after ~~<nowiki>~~{{val\|98.7\|e=3}}~~</nowiki>~~.		{{tlx\|val\|2\|u{{=}}billion}} would start sorting after {{tlx\|val\|98.7\|e{{=}}3}}.

	==== SI flag ====		==== SI flag ====

← Previous revision		Revision as of 23:43, 2 December 2024
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	To test a ''newly added'' unit not used on any page, you will need to run the preview on a sandbox page you have already created. Here are all the test cases you can preview there before saving your changes here; they are the four {{para\|u}} parameters:		To test a ''newly added'' unit not used on any page, you will need to run the preview on a sandbox page you have already created. Here are all the test cases you can preview there before saving your changes here; they are the four {{para\|u}} parameters:
			<syntaxhighlight lang="wikitext">
	<pre>
	{{Val\|9\|u = }}		{{Val\|9\|u = }}
	{{Val\|9\|ul = }}		{{Val\|9\|ul = }}
	{{Val\|9\|u=foo\|up = }}		{{Val\|9\|u=foo\|up = }}
	{{Val\|9\|u=foo\|upl = }}		{{Val\|9\|u=foo\|upl = }}
			</syntaxhighlight>
	</pre>

	and the [[Help:Table#Sortable_tables\|sortable table]]:		and the [[Help:Table#Sortable_tables\|sortable table]]:

			<syntaxhighlight lang="wikitext">
	<pre>
	{\| class="wikitable sortable" summary="Sortable table to test Val sorting"		{\| class="wikitable sortable" summary="Sortable table to test Val sorting"
	! Val number and unit		! Val number and unit
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	\| {{val\|4\|u= }}		\| {{val\|4\|u= }}
	\|}		\|}
			</syntaxhighlight>
	</pre>

	This table falls into place unsorted, so when your unit accepts an [[SI prefix]] you can test, say, k, m, and G, with your unit, and compare with e notations 1e3, 1e6, and 1e9 in the number. For example, Val sorts these two as equal: <code>1e3 m</code> (standard [[scientific notation#E notation\|e notation]]) and <code>1 km</code>.		This table falls into place unsorted, so when your unit accepts an [[SI prefix]] you can test, say, k, m, and G, with your unit, and compare with e notations 1e3, 1e6, and 1e9 in the number. For example, Val sorts these two as equal: <code>1e3 m</code> (standard [[scientific notation#E notation\|e notation]]) and <code>1 km</code>.