Addendum: This article mocks the d34, saying “…there is absolutely no reason you would want to use a d34 or even multiples.” This, of course, is entirely incorrect.
Three 34-sided dice minus 2 (3d34-2), added together, produce numbers from 1 – 100 on a bell curve distribution, which is extremely helpful when producing percentile stats or determining percentile successes. I’m writing an RPG right now, and I would be using 3d34-2 for success rolls — if I thought anyone who might want to play my game actually owned three 34-sided dice, or would be willing to buy them.
As it is, I’m sticking with regular percentile dice (2d10). But if it were up to me…