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A regular icosahedron that probably every tabletop role-player has seen, this die is perhaps the most famous of the polyhedral dice. Each of the little triangular faces has a number from 1 to 20 on it. Though it lacks the strange shape of the d10 or the strange rolling method of the d4, the sheer number of sides can be intimidating to a complete gaming newbie.

In all the incarnations of D&D and AD&D, this die is used for core rolls such as attack rolls, saving throws, and ability checks. In 3rd Edition D&D, the d20's role is vastly expanded, making it the most important die by far in the new version of the game.