Unsupported titles/Number sign

Character	# 1
Unicode name	NUMBER SIGN
Codepoint	U+0023
" ← Basic Latin → $

See also ♯

Translingual

Symbol

#

1. (set theory) The cardinality of a set.

   That is, for a set $S = \{s_1,s_2,s_3, \dots , s_n\},$ #S = n.

2. (computing) The hash character
3. Alternative form of ‡.
4. (chess notation) checkmate
5. (television) Used in subtitles to indicate that the enclosed text is song lyrics
6. (Usenet) Used to pad the left side of a quotation from a manual or official source.

Derived terms

• ﹟ (small form variant)

Coordinate terms

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

Usage notes

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

Synonyms

• (chess): ++

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English

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"

Related terms

• £

Synonyms

• (number): no.

See also

• Number sign on Wikipedia.Wikipedia:Number sign