A regular dodecahedron or pentagonal dodecahedron is a dodecahedron that is regular composed of twelve regular pentagonal faces, with three meeting at each vertex, and is represented by the Schläfli symbol {5,3}. It is one of the five Platonic solids. It has 20 vertices, 30 edges and 160 diagonals (60 face diagonals, 100 space diagonals).