You know what it looks like… but what is it called?
TAKE THE QUIZ“Zener”
The following 2 entries include the term Zener.
: a silicon semiconductor device used especially as a voltage regulator
Zener cards
plural noun: a set of 25 cards that consists of 5 cards of each of 5 kinds bearing a circle, a rectangle, a cross, wavy lines, or a star and that is used in research in extrasensory perception
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Merriam-Webster unabridged