Zocchihedron is the trade name of a 100-sided die, "invented" by Lou Zocchi, who holds a patent on that special form of dice.
It is not a polyhedron. Rather it is more like a ball with 100 flattened planes.
Zocchihedrons are designed to handle percentage rolls in games. Because they take several seconds to settle, users often find it more convenient to use two 10-sided dice of differing colours.
