What is pound key?

The pound key, also known as the hashtag symbol (#), is a character used in digital communication to categorize or tag content. It is commonly used in social media platforms like Twitter, Instagram, and Facebook to indicate a specific topic or theme.

The pound key is also used in telephony as part of a phone number. It is used to denote an extension number when calling a business or organization.

In coding and programming languages, the pound key is used to define preprocessor directives in languages like C, C++, and Perl.

Overall, the pound key is a versatile symbol that has a variety of uses in different contexts.