I'm updating the New Posters thread to include a list of acronyms and abbeviations commonly used here. This is what I have so far:
LBS - Local Bike Shop
FD - Front Dérailleur
RD - Rear Dérailleur
mech - Mechanism, usually a dérailleur and associated parts
DS - Drive Side - the side of the bike with the chain et al.
NDS - Non-Drive Side - the side of the bike without the chain
nnT - e.g. 34T - the number of teeth on a chain sprocket, usually used as the size of the sprocket
Please enlarge on the inadequacies of this list.