Unsupported titles/Number sign

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

1. (cartography) Used to denote a village.
2. (chess notation) Checkmate.
3. (computing) The hash character.
4. (medicine) A fracture.
5. (Internet) A hashtag, which is a metadata tag for use in microblogging and social network services, used to label and search content.
6. (Usenet) Used to pad the left side of a quotation from a manual or official source.
7. (mathematics, computer science) Concatenation.
8. (set theory) The cardinality of a set.

   #{ 5, 3, 7, 11 } = 4

9. (phonology) Used to indicate a word boundary.
10. (syntax) Used to indicate that a sentence is grammatical but semantically strange.
11. Alternative form of ‡

In English it is called the hash, number sign, pound sign (American), or octothorpe (uncommon).

• (chess notation): ++
• (set theory): card, | |

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

• # #
• #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. (followed by a numeral: used attributively) Number.

   #3 — "number three"

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.

4. (linguistics) Denotes a word or morpheme boundary.

• (number): no.

• £

• Number sign on Wikipedia.Wikipedia

• (superscript) ^#

Likely from English.

#

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