Prof. Giorgio Stabile (History of Science, Rome University, La Sapienza)
found the @ symbol in many ancient documents.
Actually venetian and florentine merchants used the @ symbol during the XVI
sec.
http://www.repubblica.it/misc/gallerie/chiocciola/index.html
At that time the @ symbol meant *anfora*, a capacity measure.
Prof. Stabile is quite sure that the man who invented the @ was Leonardo da
Vinci.
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