Arroba
Arroba is a Portuguese and Spanish custom unit of weight, mass or volume. Its symbol is @. History. The word "arroba" has its origin in Arabic "ar-rubʿ" (الربع) or "quarter," specifically the fourth part (of a quintal), which defined the average load which a donkey could carry . Spain and Portugal. In weight it was equal to 32 pounds (14.7 kg) in Portugal and 25 pounds (11.5 kg) in Spain. The unit is still used in Portugal and Spain by cork merchants and pig farmers. Arroba and bushel as weight units are similar (15 kg). Latin America. The unit is  still used in Brazil by the agricultural sector. The modern metric arroba used in these countries in everyday life is defined as . In Colombia, Ecuador, and Peru the arroba is equivalent to . In Bolivia nationally it is equivalent to . However locally there are many different values, ranging from in Inquisivi to in Baures. Internet. In Spanish-speaking and Portuguese-speaking countries, ""arroba"" has continued as the word for the "@" symbol used in Internet email addresses.