For the @ as a character, see At sign.
The word arroba has its origin in Arabic ar-rubʿ (الربع), the fourth part (of aquintal).
Arroba was a Spanish and Portuguese customary unit of weight, mass or volume. Its symbol is @. In weight it was equal to 25 pounds (11.5 kg) in Spain, and 32 pounds (14.7 kg) in Portugal.The unit is still used in Portugal by cork merchants, and in Brazil by cattle traders. The modern metric arroba used in these country life activities is defined as 15 kilograms (33 lb).
In Peru thearroba is equivalent to 11.5 kilograms (25 lb).
In Bolivia nationally it is equivalent to 30.46 litres (6.70 imp gal; 8.05 US gal). However locally there are many different values, ranging from11.5 litres (2.5 imp gal; 3.0 US gal) in Inquisivi to 16 litres (3.5 imp gal; 4.2 US gal) in Baures.
 See alsoPortuguese customary units
Spanish customary units
 References1.^ LaRepública, En Feria de la Mujer Emprendedora presentan antibióticos naturales saludables (Spanish)
2.^ Arroba in Bolivia
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