In Holland it's called "apestaart" (monkey tail) and in Germany it's known as "Klammeraffe" (hanging monkey). In France, it's either "arobas" or "petit escargot" (small snail). But in English, it's simply called the rather colorless "at sign". Interesting backstory on the web's darling symbol: A Sign of the TImes and Symbols.com: the @ symbol.
Blog