A d100 — also called a d%, percentile die, or a hundred-sided die — is one of several standard polyhedral dice used in gaming. Each type is generally identified by the use of the letter "d" (for "die" or "dice") and the number of sides the die features. Multiple dice are connoted by an additional number prefixing the D. So rolling five hundred-sided dice would be noted by writing 5d100. The d100 is often used for randomly generating percentages in the d20/OGL system.