That, or just a general abbreviation. If doesn’t have to be a specific form of abbreviation.
Radar (Radio Detection And Ranging) also isn’t a strict initialism, or it would be called RDAR.
Phrases like etc. (et cetera), & co. (company), vs. (versus), are also generally abbreviations.


Warframe has a roguelike gamemode where one upgrade you can get gives +100% mag size per stack and +1 shock damage per reloaded bullet. If you have two stacks of that with a weapon with a base mag of 30 shots, that’s a damage bonus of up to 90 if you fully empty it before reloading.
I got two stacks of it with a weapon with base mag size 200 and base damage 40. I don’t remember what the weapon mods pushed that base damage to, but I do know that the 600 bonus damage was very much felt… when I did the reflex reload after firing ten bullets and suddenly my DPS were abysmal.