The professor (i) _______ the ancient symbol in the course of researeh for a visual history of the 20th century, to be published by the Trecca in Encyclopedia. The first (ii) _______ instance of its use, he says, occurred in a letter written by a Florentine merchant on May 4th, 1536. He says the sign made its (iii) ________  along trade routes to northern Europe, where it came to represent “at the price of” – its contemporary accountancy (iv) _______  . Professor Stabile believes that Italian banks may possess even earlier documents (v) _______ the symbol lying forgotten in their arehives. The oldest example could be of great value. The race is on between the mercantile world and the banking world to sec who has the oldest documentation of @.

(i)_____

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