Where did the "dog" come from in email

In the official history of the Internet, it is believed that the @ sign in an email address was introduced by the American electronic engineer Ray Tomlinson. In 1971, he sent the world's first email message across the Web.

Since at that moment he was forced to act in two roles at once - both the sender and the addressee - he had to invent the form of the email address himself.

To avoid confusion in the spelling of names, he chose a character on the keyboard as a "separator" that never appears in first and last names. And on a computer keyboard, this symbol appeared as an inheritance from the keyboard of typewriters. Back in 1885, the first model of the Underwood typewriter (USA) was equipped with a key with the @ symbol.

However, the @ symbol itself comes from at least the early Middle Ages. The Italian researcher Giorgio Stabile discovered in the archives of the Institute for Economic History of the city of Prato near Florence a document where this sign is found in writing for the first time. The document (a letter from a Florentine merchant), dated 1536, mentions three merchant ships that arrived in Spain and their cargo contains containers of wine marked with the @ symbol.

After analyzing the data of that time on the prices of wine and the capacity of vessels and comparing them with the system of measures, Stabile came to the conclusion that the @ sign was used as a measuring unit replacing the word "amphora" ("amphora" - a vessel; this is how the universal measure of volume). So the roots of the "pedigree" of the modern postage sign are literally lost in hoary antiquity.