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 ℔.

The symbol known as the hashtag (#) in Twitter has a history of different names and uses in American English, including pound sign – used after a number to mean “weight in pounds,” number sign – used in front of a number to mean “number” (as in "Please review item #2 on the list"), crosshatch, and hash mark.

Jun 24, 2012 · Simply put, a hashtag is an easy way for people to categorize, find and join conversations on a particular topic. The hashtag is used to highlight keywords or topics within a Tweet, and can be placed anywhere within a post.

.hack//Sign (stylized as .hack//SIGN) is a Japanese anime television series directed by Kōichi Mashimo, and produced by studio Bee Train and Bandai Visual, that makes up one of the four original storylines for the .hack franchise.

Nov 7, 2017 · What is the # symbol called? 1: The pound sign. This name came to be because the symbol comes from the abbreviation for weight, lb, or libra pondo, literally “pound by weight,” in Latin. When writing “lb,” scribes often crossed the letters with a line across the top, like a t. 2: The number sign.

Explore the meaning, origin, and various uses of the number sign (#), also known as the hash symbol or pound sign. Discover its significance in mathematics, social media, and computing.

Mar 15, 2025 · Also called a hash, number sign, or pound sign, the octothorpe is the typographical symbol "#" (two horizontal lines and two vertical lines, crossed). On US …

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 social media platforms.

May 26, 2015 · The official name of the number sign, the one located at the bottom right hand corner of phone keypads and used to label hashtags on social media, is octothorpe. Also called a hash or a pound...

From the Romans to Twitter, the hash sign – or octothorpe – has had a rich history, and now this innocuous little character has found a mighty resurgence as the hashtag. What happened along the way?