A one-way deck is a deck of playing cards where the back of the cards has a pattern that can be oriented to have a "top" and "bottom". Magicians and card sharps can use the orientations of cards in one-way decks to encode information that allows them to perform card tricks.
A one-way deck is a deck of playing cards where the back of the cards has a pattern that can be oriented to have a "top" and "bottom". Magicians and card sharps can use the orientations of cards in one-way decks to encode information that allows them to perform card tricks.
Source: Wikipedia "One-way deck" · CC BY-SA 4.0
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