Ah, I see you queried google in a different manner than I did, with "what does the c in cmbp mean?" whereas I in my infinite humility queried "cmbp", "cmbp vs. rmbp", "what is cmbp?".
I think the correct term should be uMBP for unibody Macbook Pro. "Classic" doesn't really seem right when the the unibody MBP was the second generation of the MBP.