Elon Musk adopted the moniker "Kekius Maximus" on X Tuesday, sparking speculation among his 210 million followers about his mysterious new handle that is a mash-up of an alt-right symbol, a memecoin, and the lead character of the movie "Gladiator." HT Image Musk, the CEO of Tesla and SpaceX and a confidant of US President-elect Donald Trump, also replaced his …