We've talked about this before, but those posts were probably lost in the purge. My suggestions were based on the different functions that the CASM chunk serves.
The most obvious suggestion for "C" is probably "Chord" or "Chordal," but I think another possibility is "Channel," because the CASM chunk specifies which MIDI channels to use for which style parts-- that is, "source channel" and "destination channel." So "CA" could stand for "Channel Assignment."
Likewise, the most obvious suggestion for "S" is probably "Style," but I think another possibility is "Section," because the CASM chunk handles the sections of the style file. So "SM" could stand for "Section Management."
CASM = Channel Assignment / Section Management?