What is press pound?

Pressing the pound (#) button is often used to mark the end of a sequence of numbers or inputs on a phone keypad. It is also commonly referred to as the "hash" symbol, the "number sign," or the "octothorpe." In some contexts, the pound button may be used as a prompt for users to enter a passcode or other authentication information. Additionally, the pound symbol is often used in computing and coding environments as a special character to indicate the beginning of a comment or to perform certain types of operations.