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How to Insert a # Symbol (Hashtag or Number Sign) in LaTeX
You can write a number sign symbol in a LaTeX by typing \#.
You can use it the same way in an equation envrionment by typing \(\# \) or $\#$.
If you do not escape the number sign you will get the error message shown in listing 2.
The Hashtag Symbol in Social Media
Since 2007 the numbering sign is used in social media to annotate tags.