CSM
CSM is the acronym for Command and Service Module used in the Apollo Project. This term is used when the Command Module/CM and Service Module are in joint configuration.
The below diagram (Modified from the Skylab Write up by Hooverdirt) shows what I mean:
CSM
Service Module
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@############M########
#...... ..=X /@#X
%# ####- /- #@
;#M- %/ #@ :- /#H
X/MM###- .X/ :- M#
%- M#M+. X/ =: :##
%- ,##.%/ :/ X##
%/ +##/ -/ . ./#M
+/ #;/ -/ ###M:
%/ /-/ -M ##/M
+/ @#/ ./ ###
%/ #M#/ ./ $M
$= /#H %/ . ./ . .##
#: .,@##. X/ # . /@
. #/@###@. X# ..$ # ##
%##/ %/ /###: .X ;#M
;# +X##; ###=
. .#/#//%#%%#XXX$XX#XX#H#
/|\
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Command Module
The CSM was also used in all three manned missions to the Skylab and one was used in the Apollo-Soyuz test project. Apollo-Soyuz was the last time America had a splashdown with a Command Module.