<P> A loaded, weighted, or crooked die is one that has been tampered with so that it will land with a specific side facing upwards more or less often than a fair die would . There are several methods for creating loaded dice, including rounded faces, off - square faces and weights . Transparent acetate dice are used by casinos as they are harder to tamper with than other dice . </P> <P> Around the end of the 1960s, non-cubical dice became popular among players of wargames, and since have been employed extensively in role - playing games and trading card games . The numerals 6 and 9, which are reciprocally symmetric through rotation, are distinguished with a dot or underline . </P> <P> Dice are often sold in sets, matching in color, of six different shapes . Five of the dice are shaped like the Platonic solids, whose faces are regular polygons . Aside from the cube, the other four Platonic solids have 4, 8, 12, and 20 faces, allowing for those number ranges to be generated . The only other common non-cubical die is the 10 - sided die, a pentagonal trapezohedron die, whose faces are ten kites, each with two different edge lengths, three different angles, and two different kinds of vertices . Such sets frequently include a second 10 - sided die either of contrasting color or numbered by tens, allowing for a pair of 10 - sided dice to generate numbers between 1 and 100 . </P> <P> Using these dice in various ways, games can closely approximate the real probability distributions of the events they simulate . For instance, 10 - sided dice can be rolled in pairs to produce a uniform distribution of random percentages, and summing the values of multiple dice will produce approximations to normal distributions . </P>

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