Arroba

For the @ as a character, see At sign.

Arroba was a Portuguese and Spanish custom unit of weight, mass or volume. Its symbol is @. In weight it was equal to 32 pounds (14.7 kg) in Portugal and 25 pounds (11.5 kg) in Spain.

The word arroba has its origin in Arabic ar-rubʿ (الربع), the fourth part (of a quintal), the term defined the load that a donkey or mule could carry.