At sign

The term arroba (from classical Arabic ربع rubʿ, «fourth, fourth part») is usually represented by the typographic symbol «@» in any of its possible meanings:

• arroba: a typographical symbol (used to abbreviate the measurements of such measure, of which it takes name), very used in computer;
• arroba: an old mass unit used in Spain and Hispanic America;
• arroba: an old volume unit used in Spain and Spanish;

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