You all have some weird mental deficiency where you expect every grouping of three capital letters to be an abbreviation. It is not an abbreviation.
Typically a grouping of more than 2 capital letters is an acronym, especially when it's not a word.
CIA, FBI, KGB, RPG, MMO, FPS, TPS, ABS, MILF, IKEA, FML, GRU, PQR, JVS...
It seems odd to anyone that 3 capital letters is not an acronym.