d20 is short for a 20-sided die, which are usually icosahedrons (each face is an equilateral triangle). Most dice in The Quest for the Magic Carrot are d12s, but there is one clear d20 in the Violet Booster Deck. Twenty-sided dice are used to keep score in Ultimate Odyssey, and the red die that comes with The Journey to Jupiter's Laser Red Booster Deck is a d20.

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