Arroba
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Arroba is a Portuguese, Catalan and Aragonese customary 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.[citation needed]
Iberian Peninsula
In weight it was equal to 32 pounds (14.7kg) in Portugal and 25 pounds (11.5kg) in Galicia, Asturias, Basque Country, Aragon, Catalonia, Valencia, Castille, León and Andalusia.
The unit is still used by cork merchants and pig farmers.
Latin America
The unit is still used in Brazil by the agricultural sector, mainly in the cotton and cattle business. The modern metric arroba used in these countries in everyday life is defined as 15 kilograms (33lb).
In Colombia, Ecuador, and Peru the arroba is equivalent to 12.5 kilograms (28lb).
In Bolivia nationally it is equivalent to 30.46 litres (6.70impgal; 8.05USgal). However locally there are many different values, ranging from 11.5 litres (2.5impgal; 3.0USgal) in Inquisivi to 16 litres (3.5impgal; 4.2USgal) in Baures.
Internet
In Ibero-Romance and Occitano-Romance languages, "arroba" has continued as the word for the "@" symbol used in Internet email addresses and other messaging and collaboration software.