A proper name commonly used for people, often short for Sally or Salvador; also an archaic or informal term for salt.
As a name, Sal derives from Sally (Sarah) or Spanish Salvador (meaning 'savior'). As salt, it comes from Latin 'sal,' which is the direct root for the English word 'salt' and many Romance language variants.
Salt was so valuable historically that 'salary' comes from the same root—Roman soldiers were sometimes paid in salt instead of money because it was worth its weight in precious goods, making Sal a name tied to ancient economics!
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