For the longest time, I ignored the map name prefixes, since I had no idea what they stood for, but I was hoping someone could fill me in on their meanings.
And for anyone who's too lazy to google the prefixes:
CS - hostage rescue
DE - target demolition
AS - assassination (no longer official)
ES - escape (no longer official)
FY - round-based deathmatch (stands for "f*** you" I believe)