Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun set theory A set with no elements: the empty set.
  • noun linguistics A symbol for a null form. Ø is commonly used instead.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

The set-theoretic meaning of this symbol was introduced by Nicolas Bourbaki in his treatise Éléments de mathématique.

Examples

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