Proper Dice Gamers use all sorts of dice.
Dice are usually some sort of regular polyhedra.
Best known are the Pythagorean solids, the classical d4, d6, d8, d12, and d20, but other shapes are also used, primarily the d10. In addition to these, a d30 and a d100 are available in well-stocked game stores. The d100 is less certain, since its surfaces aren't clearly defined. In other words, the faces on the die must be indistinguishable barring mirror symmetry. We now turn to the math.