> The letter in a distinctive font, though (which is what they're doing), very likely. But it’s not actually “X”. The symbol while obscure is called “ Mathemat

> The letter in a distinctive font, though (which is what they're doing), very likely. But it’s not actually “X”. The symbol while obscure is called “ Mathematical Double-Struck Capital X “. Graphically the logo seems completely identical to the Unicode character. I don’t know if they can register it as a trademark it but would sure seem weird if you could that with something like “ ∫ “