"Remote controller too shell module" is more likely to be in the remote than AC And if it was just a shell assay it would say shell. My guess is a PCB (might even include pots/switches) that physically attached to the top shell of the remote.
Why not ask the person that provided the description to you- they shouldn't have to guess.I have asked around my circles and still can not find anything specific. I appreciate the replies and that is what we are guessing too, but I was hoping the term could be isolated to a component function, if possible.