12-sided dice are based on the Platonic solid dodecahedron. Scientists have even uncovered these in ruins of Greek and Roman civilizations! However, today you can find them in table-top role-playing games and mathematical puzzles.
Why does the D10 have a 0?
The one with two digits is just telling you the tens digit, and the one with one digit is the ones digit. If you’re rolling only that die with 0, 10, 20, etc., then a 10 = a 1 and the 00 = a 10. 0 or 00 on a d10 just means the highest number.
Is a 10 sided dice fair?
Though 10-sided dice are not Platonic solids, all of their faces are the same shape and size. This means that they are as fair as Platonic solids in any reasonable situation.