Unsupported titles/Number sign

Symbol

# (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. (Internet) A hashtag, which is a metadata tag for use in microblogging and social network services, used to label and search content.
5. (Usenet) Used to pad the left side of a quotation from a manual or official source.
6. (mathematics, computer science) Concatenation.
7. (set theory) The cardinality of a set.

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

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

Etymology

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

Noun

# (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. (linguistics) denotes a word or morpheme boundary

See also

• Number sign on Wikipedia.Wikipedia