The cartwheel fails are pretty brutal, it never learned how to catch itself and break its own fall. Cartwheel is a remarkable demo, I initially thought it was a joke and fake until I saw the blooper reel. Now I half believe it.
EDIT: Future archeologist here (3 minutes after posting). It stands for "Live Performance", which is an unnecessarily obscure way of saying something that isn't obvious from the context alone.
EDIT2: Or it's this: https://en.wikipedia.org/wiki/LP_record