An arroba was a Spanish an Portuguese unit of weight, mass or volume. Its symbol is @. In weight it is equal to about 25 pounds. In the Spanish language and Portuguese language, the term arroba has now become synonymous with the symbol due to its use in e-mail addresses. The word arroba has its origin in Arabic ar-rubʿ (الربع), the fourth part (of a quintal). Arroba is widely used in Brazil and other countries as weight unit for cattle