In geometry, a Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex. They have the unique property that the faces, edges and angles of each solid are all congruent. There are precisely five Platonic solids (shown below). The name of each figure is derived from its number of faces: respectively 4, 6, 8, 12, and 20.