At sign pendant. Sterling silver

The arroba symbol, which is represented by the @ character, is a fundamental component of email addresses.
It is also used in several computer applications.
The term "arroba" comes from the Arabic الربع (ar-rubʿ), which means 'a quarter' and was used in Spain to represent the unit of mass called also arroba. In English it reads at [æt] ("a »,« Next to »or« in »), hence its use in computer science