Mister Reese's, King of Magnets ...... except they spell it "Hysteresis". It looks like hysterical but it is pronounced "Hister Reece's".
Hysteresis is a science word that means measurable delayed-effect.
Like, if you put a Reese's peanut butter cup in your mouth, it takes about 2 seconds before you realize how good it is. Then you smile. The hysteresis is 2 seconds.
With magnets, when the magnet moves past a coil, it takes the coil a little time to realize .... "Zoom! There went a magnet!"