Ok thx. I thought of P being Power, but that would be redundant (again).
Almost all my flying has been stateside, where we have:
SEL - Single Engine Land
SES - Single Engine Sea
MEL - Multi Engine Land
MES - I suppose there are a few
I have to admit I don't know what they use for gliders, rotorcraft, lighter than air and I'm not even sure what "Lifting Bodies" are.