null sign

Fetched 2026-10-26 (cache).

Synonyms: call sign

Antonyms: call sign

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|set theory}} The [[sign]] [[∅]], [[associated]] with [[empty set]]s.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.