People new to roleplaying may never have seen dice with other than six sides. A variety of them can be found at most game stores and hobby shops.
For the most part Call of Cthulhu calls for three dice roll results – abbreviated as D100, D8, D6 0 to judge the success of a skill use, to indicate how many hit points were lost to an attack or accident, to generate investigators, ect. The dice from which these rolls derive also can give D20, D10, D3, and D2 results.
The letter D stands for the word die or dice. The number after the D stands for the range of random numbers sought: D8 generates the random numbers 1 through 8, for instance, while D100 generates the numbers 1-100. For convenience, players normally use their own dice. – this can goto gameplay not character creation