A unit of weight or measure, especially used in Spanish-speaking regions, typically equivalent to about 25 pounds.
From Spanish 'arroba,' ultimately from Arabic 'ar-rub' meaning 'one-quarter' (since it was originally a quarter of a larger unit). The word traveled through Arabic into Spanish and then into English.
The 'arroba' symbol (@) that we use in email addresses comes from this word—it was an accounting shorthand meaning 'at the rate of' (like '10 arrobas @ 5 pesos each'), and programmers borrowed it for email because it looked official and was on old typewriter keyboards.
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