∅
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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]


Translingual[edit]
Etymology[edit]
The settheoretic meaning of this symbol was introduced by the Bourbaki group in their treatise Éléments de mathématique. André Weil has said in his autobiography that he based it on the Norwegian letter Ø.^{[1]}
Symbol[edit]
∅
 (set theory) A set with no elements: the empty set.
 Synonym: { }
 (linguistics) Alternative form of Ø: a null form.
 Alternative form of ⌀: the diameter sign.
References[edit]
 ^ A. Weil, The Apprenticeship of a Mathematician, chapter V "Strasbourg and Bourbaki", p. 114; Birkhäuser Verlag 1992
Hungarian[edit]
Suffix[edit]
∅
 (linguistics) A null morpheme, with several functions:
 thirdperson singular indefinite form of verbs in the indicative and conditional moods (but not in the subjunctive)
 (optionally) the subjunctive/imperative suffix j in the secondperson singular definite short forms of most verbs
 at the end of the short form of the secondperson singular indefinite subjunctive/imperative (more common than the longform ending in ál/él)
 the nominative singular form of nouns, adjectives, numerals, (present, past, and future) participles, and pronouns
 (optionally) the accusative suffix after first and secondperson possessive suffixes, chiefly in the singular
 the positive degree of adjectives
See also[edit]
 ’ (“symbol of omission”)
Vietnamese[edit]
Etymology[edit]
From the empty set symbol.
Adjective[edit]
∅
Categories:
 Mathematical Operators block
 Mathematical notation symbols
 Miscellaneous Mathematical SymbolsB block
 Translingual terms derived from Norwegian
 Translingual lemmas
 Translingual symbols
 mul:Set theory
 mul:Linguistics
 Hungarian lemmas
 Hungarian suffixes
 hu:Linguistics
 Vietnamese lemmas
 Vietnamese adjectives
 Vietnamese abbreviations