Rand Fishkin calls the "hash" or "pound symbol" a "powerful SEO tool" that many experts rarely use. Demonstrating ways to use it in his video series Whiteboard Friday, Fishkin says that "search ...

The hash symbol – also known as the pound/number sign, or even the octothorp(e) as Macworld reader Keith points out – was one of the more rarely used special characters until Twitter and Instagram ...

In some programming languages, the number sign (#), also called the "pound sign" and "hash sign," is used as a not-equals symbol. For example, the expression if amount # 500 means "if amount not equal ...