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The phrase one-eyed royals is jargon referring to the three face cards showing only one eye: the Jack of Spades (J♠), Jack of Hearts (J♥) and King of Diamonds (K♦). The terminology results from the depiction of the face on the card as being shown in profile, so only one eye is visible (all other face cards show two eyes). The jacks are also referred to, separately, as one-eyed jacks: Jack of Spades (J♠), Jack of Hearts (J♥).