Zener cards are a card deck designed by Karl Zener to test for extrasensory perception in experiments conducted with J.B. Rhine. Each deck would consist of 25 cards, with five cards each of five different designs being in each deck.
A psi wheel is a pyramid-shaped top constructed from paper or tin foil and set on a pointed object. It is an object made to attempt to prove the validity of telekinesis, with rotation of the top being attributed to being spun with one's mind.