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A polyhedron is a three-dimensional object whose faces are polygons. The most famous set of polyhedra (that's the plural) is the five Platonic Solids that may have been discovered by Pythagoras. These solids are special because they are the only ones that are made up of regular polygons. They are the tetrahedron, the cube (hexahedron), the octahedron, the dodecahedron and the icosahedron.