Not to be confused with the Numero sign (№), or Sharp (music) (♯).
#
Number sign
In Unicode
U+0023#NUMBER SIGN (#)
Different from
Different from
U+266F♯MUSIC SHARP SIGN U+2317⌗VIEWDATA SQUARE U+22D5⋕EQUAL AND PARALLEL TO
Related
See also
U+00A3£POUND SIGN U+2116№NUMERO SIGN
The symbol # is known variously in English-speaking regions as the number sign,[1]hash,[2] or pound sign.[3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔.[4]
Since 2007, widespread usage of the symbol to introduce metadata tags on social media platforms has led to such tags being known as "hashtags",[5] and from that, the symbol itself is sometimes called a hashtag.[6]
The symbol is distinguished from similar symbols by its combination of level horizontal strokes and right-tilting vertical strokes.
^"number sign". Oxford English Dictionary. Archived from the original on April 3, 2018.
^"hash". Oxford English Dictionary. Archived from the original on December 31, 2017.
^"pound sign". Oxford English Dictionary. Archived from the original on April 3, 2018. Retrieved 5 May 2016.
^Houston, Keith (2013). "The Octothorpe". Shady Characters: The Secret Life of Punctuation, Symbols, and Other Typographical Marks. W. W. Norton & Company. pp. 41–57. ISBN 978-0-393-06442-1.
^Piercy, Joseph (25 October 2013). "Part III: Symbnols of value, ownership and exchange". Symbols: A Universal Language. Michael OMara. pp. 84–85. ISBN 978-1-78243-073-5. Retrieved 4 October 2014.
^"Why is the symbol # called the hashtag in Twitter?". The Britannica Dictionary. Archived from the original on 2022-09-23. Retrieved 2022-09-23.
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