Number sign (English Wikipedia)

Crittendon, S. W. (1853). An Elementary Treatise on Book-keeping by Single and Double Entry. Philadelphia: E., C., & J. Biddle. p. 10. Retrieved 7 February 2023.
Duff, C. P.; Duff, W. H.; Duff, R. P. (1880). Book-Keeping By Single and Double Entry. Harper and Brothers. p. 21. Retrieved 24 November 2015.
Thurston, Ernest L. (1917). Business Arithmetic for Secondary Schools. New York: Macmillan. p. 419. business symbols pound.
Carnie, Andrew (2006). Syntax: A Generative Introduction (2nd ed.). Oxford: Wiley-Blackwell. ISBN 1-4051-3384-8.

avaya.com (Global: low place; English: low place)

downloads.avaya.com

"Norstar Voice Mail 4.1 | Software Add-on Guide". Nortel. p. 12. Archived from the original on 2015-12-22. Retrieved 2015-12-11.

books.google.com (Global: 3^rd place; English: 3^rd place)

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.
e.g. J. W. Marley, "The Detection and Illustration of Forgery By Comparison of Handwriting", in Proceedings of the Sixteenth Annual Convention of the Kansas Bankers' Association. Kansas City: Rusell. 1903. p. 180.
e.g. The British Printer vol. viii (1895), p. 395
Lawrence, Nancy M.; F. Ethel McAfee; Mildred M. Butler (1932). Correlated studies in stenography. Gregg. p. 141.
"Google Ngram Viewer". Archived from the original on 2024-04-05. Retrieved 2021-02-05.

britannica.com (Global: 40^th place; English: 58^th place)

"Why is the symbol # called the hashtag in Twitter?". The Britannica Dictionary. Archived from the original on 2022-09-23. Retrieved 2022-09-23.

cmu.edu (Global: 1,564^th place; English: 1,028^th place)

"#OriginStory". Carnegie Mellon University. August 29, 2014. Archived from the original on June 1, 2019. Retrieved August 23, 2019.

cnn.com (Global: 28^th place; English: 26^th place)

Warren, Christina. "Facebook finally gets #hashtags". CNN. Archived from the original on Jun 13, 2013. Retrieved July 16, 2006.

dougkerr.net (Global: low place; English: low place)

Douglas A. Kerr (2006-05-07). "The ASCII Character "Octatherp"" (PDF). Archived (PDF) from the original on 2010-12-15. Retrieved 2010-08-23.

ecma-international.org (Global: 6,722^nd place; English: 4,967^th place)

"Introduction". ECMA-334 C# language specification (PDF) (7th ed.). Ecma International. December 2023. p. xxiii. Archived (PDF) from the original on 16 December 2023. Retrieved 4 April 2024.

getproofed.com.au (Global: low place; English: low place)

"Writing Tips: How to Use the Hash Sign (#)". GetProofed. 6 February 2020. Archived from the original on 9 January 2023. Retrieved 9 January 2023. In Australia, however, it was better known as the 'hash' sign and only used to mean 'number'.

google.com (Global: 163^rd place; English: 185^th place)

"U.S. Patent No. 3,920,926". Archived from the original on 2 March 2013. Retrieved 16 September 2014.

harvard.edu (Global: 18^th place; English: 17^th place)

pds.lib.harvard.edu

"Remington Standard typewriter". New York: Wyckoff, Seamans & Benedict. 1886. p. 50.

informatica.com (Global: low place; English: low place)

"Address Formats". Archived from the original on 8 March 2016. Retrieved 14 January 2016.

itu.int (Global: 986^th place; English: 803^rd place)

"E.161 : Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network". International Telecommunication Union. 2 February 2001. Archived from the original on 2 November 2019. Retrieved 23 December 2019.

jsoftware.com (Global: low place; English: low place)

code.jsoftware.com

"Vocabulary/number". J NuVoc. Archived from the original on February 14, 2020. Retrieved November 20, 2019.

lifeprint.com (Global: low place; English: low place)

Vicars, Bill. "Lexicalization". ASL University. Archived from the original on 10 September 2015. Retrieved 6 September 2015.

lispworks.com (Global: low place; English: low place)

"Lispworks.com". Archived from the original on 10 October 2014. Retrieved 16 September 2014.

merriam-webster.com (Global: 209^th place; English: 191^st place)

"Proofreaders' Marks". Archived from the original on 2010-08-16. Retrieved 2020-09-03. from Merriam Webster

microsoft.com (Global: 153^rd place; English: 151^st place)

learn.microsoft.com

"A tour of the C# language". learn.microsoft.com. 5 April 2023. Archived from the original on 8 March 2024. Retrieved 4 April 2024.

mysmu.edu (Global: low place; English: low place)

Jack Tsen-Ta Lee. "A Dictionary of Singlish and Singapore English". Archived from the original on 19 January 2016. Retrieved 14 January 2016.

newyorker.com (Global: 146^th place; English: 110^th place)

Houston, Keith (2013-09-06). "The Ancient Roots of Punctuation". The New Yorker. Archived from the original on 2014-06-25. Retrieved 16 October 2013.

nytimes.com (Global: 7^th place; English: 7^th place)

Parker, Ashley (June 10, 2011). "Twitter's Secret Handshake". The New York Times. Archived from the original on Jun 17, 2011. Retrieved July 26, 2011.
William Safire (March 24, 1991). "On Language; Hit the Pound Sign". The New York Times. Archived from the original on July 21, 2010. Retrieved May 21, 2011.

oed.com (Global: 360^th place; English: 231^st place)

"Hash sign". Oxford English Dictionary. Archived from the original on 16 November 2018. Retrieved 14 October 2013.

oracle.com (Global: 1,514^th place; English: 1,024^th place)

download.oracle.com

"Oracle.com". Archived from the original on 28 October 2011. Retrieved 16 September 2014.

oxforddictionaries.com (Global: 710^th place; English: 648^th place)

en.oxforddictionaries.com

"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.

rfc-editor.org (Global: 6,184^th place; English: 4,465^th place)

"Channel Scope". Section 2.2. RFC 2811

royalmintmuseum.org.uk (Global: low place; English: low place)

"The Origins of £sd". The Royal Mint Museum. Archived from the original on 8 March 2020. It is not known for certain when the horizontal line or lines, which indicate an abbreviation, first came to be drawn through the L.

rsnajnls.org (Global: low place; English: low place)

radiographics.rsnajnls.org

"Glossary of Medical Devices and Procedures: Abbreviations, Acronyms, and Definitions" (PDF). Archived (PDF) from the original on 2008-06-25. Retrieved 2008-05-16.

sfwa.org (Global: 6,852^nd place; English: 4,457^th place)

McIntyre, Vonda (October 2008). "Manuscript Preparation" (PDF). sfwa.org. Science Fiction & Fantasy Writers of America. Archived (PDF) from the original on 3 October 2020. Retrieved 28 May 2020.

svpal.org (Global: low place; English: low place)

Hochhester, Sheldon (2006-09-29). "Pressing Matters: Touch-tone phones spark debate" (PDF). Encore. Archived (PDF) from the original on 2007-09-26. Retrieved 2006-12-17.

theguardian.com (Global: 12^th place; English: 11^th place)

"How the # became the sign of our times". The Guardian. Archived from the original on 31 December 2014. Retrieved 30 December 2014.

thehalogroup.com (Global: low place; English: low place)

Cohn, Lara. "###: What does ### mean at the end of a press release?". The Halo Group. Archived from the original on 17 November 2021. Retrieved 18 November 2021.

time.com (Global: 61^st place; English: 54^th place)

Nicks, Denver (June 13, 2014). "You'll Never Guess the Real Name for a Hashtag". TIME. Archived from the original on May 11, 2016. Retrieved May 5, 2016.

tucsonscrabble.com (Global: low place; English: low place)

"Scrabble Glossary". Tucson Scrabble Club. Archived from the original on 2011-08-30. Retrieved 2012-02-06.

twitter.com (Global: 23^rd place; English: 32^nd place)

support.twitter.com

"Using hashtags on Twitter". Twitter. Archived from the original on 4 May 2016. Retrieved 5 May 2016.

ultius.com (Global: low place; English: low place)

"Number Sign/Hashtag - Punctuation | Ultius". www.ultius.com. Retrieved 2025-06-05.

unicode.org (Global: 311^th place; English: 239^th place)

Unicode Consortium. "C0 Controls and Basic Latin" (PDF).
Unicode Consortium. "Unicode Named Character Sequences". Unicode Character Database. Archived from the original on 2020-07-11. Retrieved 2020-07-16.

upenn.edu (Global: 702^nd place; English: 520^th place)

languagelog.ldc.upenn.edu

"Language Log » The "pound sign" mystery". Retrieved 2025-06-05.

w3.org (Global: 691^st place; English: 581^st place)

HTML5 is the only version of HTML that has a named entity for the number sign, see https://www.w3.org/TR/html4/sgml/entities.html Archived 2018-04-01 at the Wayback Machine ("The following sections present the complete lists of character entity references.") and https://www.w3.org/TR/2014/CR-html5-20140731/syntax.html#named-character-references Archived 2017-08-05 at the Wayback Machine ("num;").
"Introduction to HTML". Archived from the original on 16 August 2008. Retrieved 16 September 2014.

w3schools.com (Global: 8,411^th place; English: 8,648^th place)

"CSS Syntax and Selectors". W3Schools. Archived from the original on 2019-07-12. Retrieved 2019-07-15.

web.archive.org (Global: 1^st place; English: 1^st place)

"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.
"Why is the symbol # called the hashtag in Twitter?". The Britannica Dictionary. Archived from the original on 2022-09-23. Retrieved 2022-09-23.
Houston, Keith (2013-09-06). "The Ancient Roots of Punctuation". The New Yorker. Archived from the original on 2014-06-25. Retrieved 16 October 2013.
"The Origins of £sd". The Royal Mint Museum. Archived from the original on 8 March 2020. It is not known for certain when the horizontal line or lines, which indicate an abbreviation, first came to be drawn through the L.
Method of Operating and Instructions for Practice on the Blickensderfer Typewriter (PDF). Atlanta, GA: K. M. Turner. 1896. p. 14. Archived from the original (PDF) on Oct 14, 2021. It is best to use the 'number mark' for plus; the hyphen for minus, and two hyphens for the sign =
"#OriginStory". Carnegie Mellon University. August 29, 2014. Archived from the original on June 1, 2019. Retrieved August 23, 2019.
Parker, Ashley (June 10, 2011). "Twitter's Secret Handshake". The New York Times. Archived from the original on Jun 17, 2011. Retrieved July 26, 2011.
Warren, Christina. "Facebook finally gets #hashtags". CNN. Archived from the original on Jun 13, 2013. Retrieved July 16, 2006.
"Norstar Voice Mail 4.1 | Software Add-on Guide". Nortel. p. 12. Archived from the original on 2015-12-22. Retrieved 2015-12-11.
William Safire (March 24, 1991). "On Language; Hit the Pound Sign". The New York Times. Archived from the original on July 21, 2010. Retrieved May 21, 2011.
"How the # became the sign of our times". The Guardian. Archived from the original on 31 December 2014. Retrieved 30 December 2014.
"Writing Tips: How to Use the Hash Sign (#)". GetProofed. 6 February 2020. Archived from the original on 9 January 2023. Retrieved 9 January 2023. In Australia, however, it was better known as the 'hash' sign and only used to mean 'number'.
"Hash sign". Oxford English Dictionary. Archived from the original on 16 November 2018. Retrieved 14 October 2013.
"Using hashtags on Twitter". Twitter. Archived from the original on 4 May 2016. Retrieved 5 May 2016.
Jack Tsen-Ta Lee. "A Dictionary of Singlish and Singapore English". Archived from the original on 19 January 2016. Retrieved 14 January 2016.
"Address Formats". Archived from the original on 8 March 2016. Retrieved 14 January 2016.
Hochhester, Sheldon (2006-09-29). "Pressing Matters: Touch-tone phones spark debate" (PDF). Encore. Archived (PDF) from the original on 2007-09-26. Retrieved 2006-12-17.
Douglas A. Kerr (2006-05-07). "The ASCII Character "Octatherp"" (PDF). Archived (PDF) from the original on 2010-12-15. Retrieved 2010-08-23.
Quinion, Michael (19 May 2010). "Octothorpe". World Wide Words. Archived from the original on 18 May 2016. Retrieved 10 May 2016.
"U.S. Patent No. 3,920,926". Archived from the original on 2 March 2013. Retrieved 16 September 2014.
"A tour of the C# language". learn.microsoft.com. 5 April 2023. Archived from the original on 8 March 2024. Retrieved 4 April 2024.
"Introduction". ECMA-334 C# language specification (PDF) (7th ed.). Ecma International. December 2023. p. xxiii. Archived (PDF) from the original on 16 December 2023. Retrieved 4 April 2024.
"E.161 : Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network". International Telecommunication Union. 2 February 2001. Archived from the original on 2 November 2019. Retrieved 23 December 2019.
"Google Ngram Viewer". Archived from the original on 2024-04-05. Retrieved 2021-02-05.
HTML5 is the only version of HTML that has a named entity for the number sign, see https://www.w3.org/TR/html4/sgml/entities.html Archived 2018-04-01 at the Wayback Machine ("The following sections present the complete lists of character entity references.") and https://www.w3.org/TR/2014/CR-html5-20140731/syntax.html#named-character-references Archived 2017-08-05 at the Wayback Machine ("num;").
"CSS Syntax and Selectors". W3Schools. Archived from the original on 2019-07-12. Retrieved 2019-07-15.
"Introduction to HTML". Archived from the original on 16 August 2008. Retrieved 16 September 2014.
"Lispworks.com". Archived from the original on 10 October 2014. Retrieved 16 September 2014.
"Oracle.com". Archived from the original on 28 October 2011. Retrieved 16 September 2014.
"HISOFT DEVPAC ZX Spectrum Programmer's Manual" (PDF). worldofspectrum.org. Archived (PDF) from the original on 2018-11-12. Retrieved 2017-10-03.
Nicks, Denver (June 13, 2014). "You'll Never Guess the Real Name for a Hashtag". TIME. Archived from the original on May 11, 2016. Retrieved May 5, 2016.
"Vocabulary/number". J NuVoc. Archived from the original on February 14, 2020. Retrieved November 20, 2019.
Vicars, Bill. "Lexicalization". ASL University. Archived from the original on 10 September 2015. Retrieved 6 September 2015.
Cohn, Lara. "###: What does ### mean at the end of a press release?". The Halo Group. Archived from the original on 17 November 2021. Retrieved 18 November 2021.
"Glossary of Medical Devices and Procedures: Abbreviations, Acronyms, and Definitions" (PDF). Archived (PDF) from the original on 2008-06-25. Retrieved 2008-05-16.
"Proofreaders' Marks". Archived from the original on 2010-08-16. Retrieved 2020-09-03. from Merriam Webster
McIntyre, Vonda (October 2008). "Manuscript Preparation" (PDF). sfwa.org. Science Fiction & Fantasy Writers of America. Archived (PDF) from the original on 3 October 2020. Retrieved 28 May 2020.
"Scrabble Glossary". Tucson Scrabble Club. Archived from the original on 2011-08-30. Retrieved 2012-02-06.
Unicode Consortium. "Unicode Named Character Sequences". Unicode Character Database. Archived from the original on 2020-07-11. Retrieved 2020-07-16.

worldofspectrum.org (Global: 8,634^th place; English: 5,821^st place)

"HISOFT DEVPAC ZX Spectrum Programmer's Manual" (PDF). worldofspectrum.org. Archived (PDF) from the original on 2018-11-12. Retrieved 2017-10-03.

worldwidewords.org (Global: 4,329^th place; English: 2,847^th place)

Quinion, Michael (19 May 2010). "Octothorpe". World Wide Words. Archived from the original on 18 May 2016. Retrieved 10 May 2016.

xavier.edu (Global: low place; English: low place)

site.xavier.edu

Method of Operating and Instructions for Practice on the Blickensderfer Typewriter (PDF). Atlanta, GA: K. M. Turner. 1896. p. 14. Archived from the original (PDF) on Oct 14, 2021. It is best to use the 'number mark' for plus; the hyphen for minus, and two hyphens for the sign =

Number sign (English Wikipedia)

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harvard.edu (Global: 18th place; English: 17th place)

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informatica.com (Global: low place; English: low place)

itu.int (Global: 986th place; English: 803rd place)

jsoftware.com (Global: low place; English: low place)

code.jsoftware.com

lifeprint.com (Global: low place; English: low place)

lispworks.com (Global: low place; English: low place)

merriam-webster.com (Global: 209th place; English: 191st place)

microsoft.com (Global: 153rd place; English: 151st place)

learn.microsoft.com

mysmu.edu (Global: low place; English: low place)

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oracle.com (Global: 1,514th place; English: 1,024th place)

download.oracle.com

oxforddictionaries.com (Global: 710th place; English: 648th place)

en.oxforddictionaries.com

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royalmintmuseum.org.uk (Global: low place; English: low place)

rsnajnls.org (Global: low place; English: low place)

radiographics.rsnajnls.org

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svpal.org (Global: low place; English: low place)

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support.twitter.com

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languagelog.ldc.upenn.edu

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w3schools.com (Global: 8,411th place; English: 8,648th place)

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worldwidewords.org (Global: 4,329th place; English: 2,847th place)

xavier.edu (Global: low place; English: low place)

site.xavier.edu

archive.org (Global: 6^th place; English: 6^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

britannica.com (Global: 40^th place; English: 58^th place)

cmu.edu (Global: 1,564^th place; English: 1,028^th place)

cnn.com (Global: 28^th place; English: 26^th place)

ecma-international.org (Global: 6,722^nd place; English: 4,967^th place)

google.com (Global: 163^rd place; English: 185^th place)

harvard.edu (Global: 18^th place; English: 17^th place)

itu.int (Global: 986^th place; English: 803^rd place)

merriam-webster.com (Global: 209^th place; English: 191^st place)

microsoft.com (Global: 153^rd place; English: 151^st place)

newyorker.com (Global: 146^th place; English: 110^th place)

nytimes.com (Global: 7^th place; English: 7^th place)

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oracle.com (Global: 1,514^th place; English: 1,024^th place)

oxforddictionaries.com (Global: 710^th place; English: 648^th place)

rfc-editor.org (Global: 6,184^th place; English: 4,465^th place)

sfwa.org (Global: 6,852^nd place; English: 4,457^th place)

theguardian.com (Global: 12^th place; English: 11^th place)

time.com (Global: 61^st place; English: 54^th place)

twitter.com (Global: 23^rd place; English: 32^nd place)

unicode.org (Global: 311^th place; English: 239^th place)

upenn.edu (Global: 702^nd place; English: 520^th place)

w3.org (Global: 691^st place; English: 581^st place)

w3schools.com (Global: 8,411^th place; English: 8,648^th place)

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