Definition from Wiktionary, the free dictionary
|Unicode name||EMPTY SET|
See also: Ø [U+00D8 LATIN CAPITAL LETTER O WITH STROKE], ⌀ [U+2300 DIAMETER SIGN], and ø [U+00F8 LATIN SMALL LETTER O WITH STROKE]
The set-theoretic meaning of this symbol was introduced by Nicolas Bourbaki in his treatise Éléments de mathématique.
- (set theory) A set with no elements: the empty set.
- (linguistics) A symbol for a null form. Ø is commonly used instead.