Original: Sicherman dice, a pair having the same odds of rolling a given sum as a pair of standard six-sided dice, but with different markings: one die has 1, 3, 4, 5, 6, and 8, and the other has 1, 2, 2, 3, 3, and 4.
Simplified: Most dice are cubes that have the numbers 1, 2, 3, 4, 5 and 6 on the faces.