What is the pound key?

The pound key, also known as the number sign or hashtag, is a symbol (#) typically found on telephone keypads and computer keyboards. It is used for a variety of purposes, such as indicating a number in a sequence, serving as a symbol for a unit of weight, and representing social media tags or keywords.

In telecommunications, the pound key is used to navigate automated phone systems or voicemail menus by entering numeric options. It is also commonly used in social media to categorize or search for posts on a specific topic, known as a hashtag.

On a computer keyboard, the pound key is often used as a shortcut in programming languages or spreadsheet applications. In some countries, the pound key is also used as part of a currency symbol, such as the British pound (£) and the Turkish lira (₺).

Overall, the pound key is a versatile symbol that is used for a variety of functions in both digital and analog communication systems.