At gmail sign symbol

You're referring to the @ symbol!

The @ symbol is known as the "at sign" or "at symbol". It's a punctuation mark used in many languages, including English, to indicate that something is related to or belongs to someone or something else.

In the context of email addresses, the @ symbol is used to separate the local part (the part before the @ symbol) from the domain name (the part after the @ symbol). For example, in the email address "[email protected]", the @ symbol separates the local part "john.doe" from the domain name "gmail.com".

The @ symbol has many other uses beyond email addresses, such as in programming, mathematics, and even in everyday language to indicate a relationship or connection between two things.