In the United States, the boring name for it is "the commercial at-sign." Sorry.
However, in comic strips, it is one of the symbols that is used to show that a character is swearing, along with stars, exclamation points, and a few others. As in, "Oh, &@!!*꩜⭑!!"
In French, we say "arobase".
Oh, I remember asking about the Ukrainian @ here on italki, and apparently they see it just as Italians: it's "равлик" (ravlyk) = snail :)