Totally mind-blown that this IJ name doesn't stand for anything. But what could it stand for, before this name was created? How can anyone imagine that I.J. doesn't stand for anything, and that the name of this river is just I.J.?
Have you seen any acronyms or any name pronounced as if it is an acronym that does not stand for anything?
Yep. I mean this river, the I.J. river in Amsterdam. But no matter I try, I could not get a reasonable decomposition of this acronym.
BTW (By the way), we know UFO is Unidentified Flying Object, TV is TeleVision, PS3 is Playstation Three, and ET Cetra (etc.) In fact, some words, such as laser, radar, and scuba became words of their own, and before they were just acronyms, i.e. LASER, RADAR, SCUBA. In which you pronounce the individual letters of this acronym.