PP

PP or Psychic Points is an unit of measurement for psionic or psychokinetic potential, it measures how many PSI abilities can be used without harming or exhausting yourself.

In order to restore your PP you usually need to eat, however, some other techniques such as playing with butterflies might be used to do so.

Normal Dude: "Can you do the fireworks trick again?"
Psionic Dude: "Nah man, i havent got any PP left"