| The @ symbol has been in use for centuries, since long before email made it one of the most-typed characters on Earth. The first documented use dates all the way back to a 1536 letter written by an Italian merchant, who used a looping "a" as shorthand for amphorae — a traditional unit of volume roughly equal to a standard clay amphora jar. In other contexts, medieval scribes also used the symbol to mean "at the rate of," helping to make calculations and bookkeeping more efficient. As global trade expanded, merchants began using @ in ledgers to indicate price per unit — for example, three barrels @ five florins each. That practical function kept the symbol alive for hundreds of years, even as writing styles, currencies, and languages evolved. The average person, however, rarely encountered it outside of accounting and typewriters. That changed dramatically in 1971, when computer engineer Ray Tomlinson needed a character to separate a username from a host computer in the world's first networked email. It had to be a symbol that was rarely used in names, yet widely understood across keyboards. He selected @, a typographic character used by developers that at the time meant "located at" — as in "user at computer." More than five decades later, the @ symbol now helps route billions of messages daily and anchors our digital identities across email and social platforms. Not bad for a 16th-century bookkeeper's shorthand. | 
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