Percentile dice

Percentile dice (d%)

Often, the variable X in the above notation will be 100, alternatively written "%". Although 100-sided dice exist, it is more common to use a combination of two ten-sided dice known as "percentile dice". One die represents units and the other tens; typically these are distinguished by color, but dice marked with multiples of ten are also available for use as the "tens" die. Ten-sided dice intended specifically for use as percentile dice typically have no tens notation (the faces are numbered such that there are two complete sequences of 0 through 9). A roll of 0 on both dice may be interpreted as either 0 or 100, depending on the game rules; however, it is rare for the 0 on the ones die to be read as 10, making a roll of zero on both dice equal to 10 (0 tens, and 10 ones).