"An acronym is a label formed from the beginnings of words (Greek: acro [head] and nym [word]) -- or very rarely, from letters in the middle of words. There is no requirement that an acronym be pronounceable as a normal word (this is a curious myth perpetuated by American dictionaries): IBM is just as much an acronym as LASER."
If you've got a SNAFU bigger than NATO, than you need to see this site, ASAP: Acronym Server Simplified.