What is the sign or abbreviation to represent an element?

Answer 1

The sign or abbreviation to represent an element is called an "atomic symbol", and there is a distinct one for each element. Every atomic symbol begins with a capital letter, which may constitute the entire symbol but is usually followed by a lower case letter.

Answer 2

The sign or abbreviation to represent an element is known as its chemical symbol. Each element has a unique chemical symbol typically derived from its name in English, Latin, or other languages. For example, the chemical symbol for oxygen is "O" and for iron is "Fe".