The standard notation for this class uses the number sign symbol, not the sharp sign from music, but it is pronounced "sharp P". More generally, the number sign may be used to denote the class of counting …

number sign, versatile symbol (#) most commonly used to preface numbers (e.g., apartment #1) but which encompasses a variety of other uses, especially to tag (or hashtag) posts and messages on …

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The numero sign or numero symbol, № (also represented as Nº, No̱, No., or no.), [1][2] is a typographic abbreviation of the word number (s) indicating ordinal numeration, especially in names and titles.

The number sign is the formal name for the symbol # in typography and standards such as Unicode, where it is officially designated U+0023 NUMBER SIGN (pronounced /ˈnʌmbər saɪn/) and used to …

The word hashtag, used to refer to the symbol (#) in Twitter, is a combination of the word hash from hash mark and the word tag, a way to mark something as belonging to a specific category.

The number sign (#) is a typographical symbol that represents the word “number” in American English and in Canada. Generally placed immediately before a number or series of digits (with no spaces), it …

In this guide, you’ll learn how to type the hashtag symbol on Windows, Mac, Microsoft Word, Excel, PowerPoint, Google Docs, Google Sheets, Chromebook, iPhone, Android, HTML, and more.

Dec 17, 2025 · The number sign is the formal name for the symbol # in Unicode and typography standards. That name matters because it separates the symbol from its many informal aliases.

Number sign is a name for the symbol #, which is used for a variety of purposes, including the designation of a number (for example, "#1" stands for "number one").