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# (English symbol name number sign or hash or pound sign or octothorpe)

1. (computing) The hash character.
2. (Internet) A hashtag, which is a metadata tag for use in microblogging and social network services, used to label and search content.
3. (chess notation) Checkmate.

   Synonym: ++

4. (medicine) A fracture.
5. (cartography) Used to denote a village.
6. (Usenet) Used to pad the left side of a quotation from a manual or official source.
7. (set theory) The cardinality of a set.

   ${\displaystyle \#\{5,3,7,11\}=4}$

   Synonyms: card, | |

8. (mathematics, computer science) Concatenation.
9. (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.
10. (phonology) Used to indicate a word boundary.
11. (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.

    #Colorless green ideas sleep furiously.

12. Alternative form of ‡.
13. Alternative form of ⌗ (“key available on telephone keypads”).
14. (music) Alternative form of ♯ (“sharp”).

• (to pad a quotation on Usenet): > (for a quotation not necessarily from a manual or official source)

• # #
• eq #
• C#
• hr #
• #MeToo

The symbol # derives from the abbreviation lb for Latin libra (“pound”), via the medieval convention of indicating abbreviations with a bar, ℔.

# (plural # or #s)

1. (food packaging, US) Pound (unit of weight).

   3# — "three pounds"

2. (attributive, precedes a numeral, chiefly Canada, US) Number.

   #3 — "number three"

   Synonym: no.

3. (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.

• £

• Number sign on Wikipedia.Wikipedia

• (superscript) ^#

Likely from English.

#

1. (Mainland China) Alternative form of 號／号 (“number”), used after a numeral.