#

The pound symbol (also known as the "hash" symbol) is most commonly used to represent numbers, as in, "I'll answer #3." In some versions of Unix, it is the system prompt. It has a variety of uses online, either as part of a cryptic password, or in creative renditions of ASCII art, or smileys.
The hashtag went mainstream when Twitter users began adding it to a word or phrase like #word when searching for tweets. For example, @netlingo often tweets under the hashtage: #acronymoftheday. It also means "net."
NetLingo Classification: Symbols


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