The only LM I know of is the "Lichess Master" title, which is some kind of honorary title awarded by lichess. It has no meaning beyond their website.
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theres no such thing as the lost murderer title lambbw but thank you for telling what a cm is
I think it's both. LM is only for USCF and lichess though.
I already know what a GM is (grand master), an FM is (fide master), an NM (national master), an IM (international master), but I don't know what a CM and an LM is. Can somebody tell me what those two are?