Ø
Appearance
Ø is a letter used in Norwegian and Danish. The lower case form is ø.
The origin of the letter form is originally a ligature for the diphthong OE that has become a letter in itself. In German and Swedish, the letter Ö with a diaeresis is the equivalent. Etymologically, Ø derives from O with an umlaut.
- It's not an O with a slash, it's an Ø.
- -- Tour guide in Norway.
The letter Ø is also used in mathematics as a symbol for the empty set. Modern typesetting software used by mathematicians (such as TeX) renders it as follows:
In HTML character entity references, required when not using ISO 8859-1 or Unicode character sets, the codes for Ø and ø are Ø and ø
See also: Danish and Norwegian alphabet