If we’re not talking about the super rich, because there is only a few dozen of them, and they have their own parallel universe… it’s usually mannerisms, language clues (in articulation and content), but of course also signals like expensive clothing and accessories. Also the places where they meet. This opens the door for all kinds of grifters who emulate behaviour and style to get into those circles. Jeffrey Epstein is an (in)famous example for this.