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The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign. 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 ℔ .
- .mw-parser-output .monospaced{font-family:monospace,monospace}U+0023 # NUMBER SIGN (#)
Learn about the history and meaning of the number sign (#), also known as hash, pound, or octothorpe. Find out how it is used in mathematics, computing, medicine, and social media.
- Stephen Eldridge
Nov 7, 2017 · Learn the origin and history of the # symbol, also known as the pound sign, number sign, hashtag, and octothorpe. Find out how it is used in different contexts, such as weight, music, code, and social media.
Feb 6, 2020 · The number sign or hashtag is a symbol with several names and uses. Learn its history, meaning, and how to use it in different contexts, such as social media, music, and code. Find out when to use it in formal writing and how to avoid common mistakes.
Learn how to use the number sign (#) in different contexts and languages. Find out its names, history, keyboard location, and alternative expressions.
The number sign ( # ) is also known as a pound sign, pound key or hash in British English. It can be used to abbreviate numbers in informal writing, such as emails, texts, journal entries and advertisements. Learn how to use it correctly in American and British English with step-by-step rules, stories and exercises.
2 days ago · Learn the meaning and usage of the symbol #, also known as number sign, in American English. Find out how to cite, share, and explore more entries in the Merriam-Webster dictionary.
