Translingual

Symbol

∅

1. (set theory) A set with no elements: the empty set.
2. (linguistics) A null form. Ø is commonly used instead.
3. See ⌀ for the diameter sign.

Synonyms

• (empty set): { }

References

1. ↑ A. Weil, The Apprenticeship of a Mathematician, chapter V "Strasbourg and Bourbaki", p. 114; Birkhäuser Verlag 1992