X-Box, X-Men, X-Files, X-Rated, The X-Factor, Fed Ex, Malcolm X, Space X, Earth Ex, Tesla Model X Elon Musk's son's name is X, X-ray, A-Xii, X marks the spot, X-cut, X-mas. and Twitter is now X. This symbolism has been around for a long time but it becoming more used now publicly. Right in the faces of the masses that just wander around drooling into their phones.