What does ELO stand for?

ELO ratings is the system of rating a player by his performance and wins in Chess. FIDE ratings and Chess.com ratings(and all other chess ratings) are also known as ELO ratings. But what does ELO stand for? Well, normally ELO is written in uppercase, but it has no full form. It's named after its creator Arpad Elo, a Hungarian-American physics professor born in 1903. ELO is often written in all caps but it doesn’t have a full form — it’s simply named after its creator Arpad Elo, a Hungarian-American physics professor born in 1903. Interesting, isn't it?