# (English symbol name number sign or hash or pound sign or octothorpe)
- (computing) The hash character.
- (Internet) A hashtag, which is a metadata tag for use in microblogging and social network services, used to label and search content.
- (chess notation) Checkmate.
- Synonym: ++
- (medicine) A fracture.
- (cartography) Used to denote a village.
- (Usenet) Used to pad the left side of a quotation from a manual or official source.
- (set theory) The cardinality of a set.
- Synonyms: card, | |
- (mathematics, computer science) Concatenation.
- (mathematics) Apartness, a binary relation such that if a#b, then any other element c is apart from at least one of a,b. See apartness relation.
- (phonology) Used to indicate a word boundary.
- (linguistics) Used to indicate that a sentence is grammatical but semantically strange.
- #Jane is a great hostess and John is too.
- #I slept a wink last night.
- Alternative form of ‡.
- Alternative form of ⌗ (“key available on telephone keypads”).
- (music) Alternative form of ♯ (“sharp”).
- (to pad a quotation on Usenet): > (for a quotation not necessarily from a manual or official source)
The symbol # derives from the abbreviation lb for Latin libra (“pound”), via the medieval convention of indicating abbreviations with a bar, ℔.
# (plural # or #s)
- (food packaging, US) Pound (unit of weight).
- 3# — "three pounds"
- (attributive, precedes a numeral, chiefly Canada, US) Number.
- #3 — "number three"
- Synonym: no.
- (Internet slang, text messaging) Number.
1997 June 17, RYankowski [username], “Why collect new U.S.?”, in rec.collecting.stamps (Usenet):
I have collected U.S. Stamps since I was a boy back in the 1950's. At that time there was a low # being printed and it was affordable.
Likely from English.
- (Mainland China) Alternative form of 號／号 (“number”), used after a numeral.