What is the '@' sign called?
Officially, this symbol is called 'commercial at'. Unofficially, most people seem to refer to it as the 'at sign' or just 'at'. Recently, there has also been a movement to call it the atmark. There are also numerous nicknames for it, including snail, curl, strudel, whorl, and whirlpool.
extract from The Internet Public Library FARQ

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