The other day I was playing a WWII strategy game, and some of the British units, had the term Coy with the name of the unit. I didn't know what that mean't so I looked it up and found that it stands for Company. What I found kind of surprised me though, a British slang term for members of the RAF are called Crabs? Not sure I want to know where that came from,lol
Found the list here-
http://www.milweb.net/features/military_acronyms.php