Ø

"Ø", "ø" is a vowel and a letter used in the Danish, Faroese and Norwegian alphabets.

Not to be confused with

Ø is not to be confused with the number "0" (zero), which is sometimes written with a slash to differentiate it from the letter "O" (this form is called the slashed zero). Once commonly used in this form by early computer models, recent computer technology has all but eliminated the need to use a slashed zero, but the symbol is still used in written Amateur radio callsign.

Related Topics:
0 - O - Slashed zero - Amateur radio

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The symbol "∅" (U+2205) is used in mathematics to refer to the empty set, following Bourbaki. Modern typesetting software used by mathematicians typically renders it in stylised form. For example, common TeX packages offer emptyset and arnothing, which respectively appear as:

Related Topics:
Mathematics - Empty set - Bourbaki - TeX

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: emptyset, arnothing

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"⌀" (U+2300) is used as the standard symbol for diameter, though the official symbol is slightly stylised (the stroke is often thinner at the bottom and thicker at the top, like the club or baton shape of the exclamation point; and extends further above the o portion). In German speaking countries it is also used as a symbol for average value: average in German is Durchschnitt, directly translated as cut-through.

Related Topics:
Diameter - Exclamation point - Average

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