Hello there! If you are new to chess or chess.com I am sure you have seen those funny little red letters... what do they mean?!?!?!?!? Well I am here to show you! The following chart has them listed from least to highest.
CM= Candidate Master
FM= Fide Master
NM= National Master
IM= International Master
GM= Grand Master
SGM= Super Grand Master (you don't see this one very much)
WCM= Woman Candidate Master
WFM= Woman Fide Master
WNM= Woman National Master
WIM= Woman International Master
WGM= Woman Grand Master
WSGM= Woman Super Grand Master (Yet again you don't see this much at all)
Good luck trying to claim one of these titles!