The [b]#[/b] sign.  Known as the [i]number sign[/i], [i]hash[/i], or in North America the [i]pound sign[/i].  Sometimes also referred to as a "[i]hashtag[/i]" due to its widespread usage in social media metatags.

The symbol has been used for a wide range of purposes, including designating a number (#2, number two), pound weight (2#, two pounds), proofreading mark indicating insert a space, the musical sharp symbol (♯) in typing, and designating social media metatags.

h4. See also

* [[Hashtag]]
* [[Tag group:symbols]]
* "Wikipedia - Number sign":[https://en.wikipedia.org/wiki/Number_sign]
number sign