Carbon is a word most people are already familiar with before encountering me on the internet. Even if they don't know everything about carbon, they know what it is; it's not esoteric or made up. Of course what carbon is in real life is no more relevant to me than it is to you, so it's not like that identifies me in any way, but I like to think it gives a first impression that doesn't inspire hostility, and that's good enough.