Names of small numbers

From Wikipedia, the free encyclopedia

This article lists and discusses the usage and derivation of names of small numbers.[1]

Table of names[edit]

The following table lists English language names of small numbers used in the long and short scales, along with the power of 10, engineering notation, and International System of Units (SI) symbols and prefixes.[2][3][4][5][6][7][8]

Short scale
(U.S. and
modern British)
Long scale
(continental Europe,
archaic British, and India)
100 1 One One
10−1 100×10−3 One Tenth One Tenth deci- d
10−2 10×10−3 One One-Hundredth One One-Hundredth centi- c
10−3 1×10−3 One One-Thousandth One One-Thousandth milli- m
10−6 1×10−6 One One-Millionth One One-Millionth micro- µ
10−9 1×10−9 One One-Billionth One One-Milliardth nano- n
10−12 1×10−12 One One-Trillionth One One-Billionth pico- p
10−15 1×10−15 One One-Quadrillionth One One-Billiardth femto- f
10−18 1×10−18 One One-Quintillionth One One-Trillionth atto- a
10−21 1×10−21 One One-Sextillionth One One-Trilliardth zepto- z
10−24 1×10−24 One One-Septillionth One One-Quadrillionth yocto- y
10−27 1×10−27 One One-Octillionth One One-Quardilliardth ronto- r
10−30 1×10−30 One One-Nonillionth One One-Quintillionth quecto- q
0 undefined Zero Zero
−∞ undefined Negative Infinity Negative Infinity

See also[edit]


  1. ^ "Binary Numbers - Floating Point". 1997-02-24. Archived from the original on 2012-03-21. Retrieved 2014-07-07.
  2. ^ American Heritage Dictionary, 4th edition, ISBN 0-395-82517-2. "The American Heritage Dictionary of the English Language, Fourth Edition. 2000". Archived from the original on 2007-01-12. Retrieved 2004-05-29.
  3. ^ Oxford English Dictionary, New Edition, Oxford, UK: Oxford University Press. [1] (subscription required)
  4. ^ Bureau International des Poids et Mesures (BIPM)
  5. ^ US NIST Definitions of the SI units: The twenty SI prefixes
  6. ^ "Large and Small Numbers - Metric Prefixes". 2012-08-26. Archived from the original on 2013-07-24. Retrieved 2014-07-07.
  7. ^ "ThinkQuest". 2013-07-01. Archived from the original on 2012-11-11. Retrieved 2014-07-07.
  8. ^ Manske, Magnus (2011-05-02). "Names of large and small numbers". Archived from the original on 2011-09-03. Retrieved 2014-07-07.