reflectional symmetry. See also Deltoidal icositetrahedron References (Section 3-9) The Symmetries of Things 2008, John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, (Chapter 21, Naming the Archimedean and Catalan polyhedra and tilings, page 286, tetragonal hexecontahedron) http://mathworld.wolfram.com/ArchimedeanDualGraph.html External links Deltoidal Hexecontahedron (Trapezoidal Hexecontrahedron)—Interactive Polyhedron Model Example in real life—A ball almost 4 meters in diameter, from ripstop nylon, and inflated by the wind. It bounces around on the ground so that kids can play with it at kite festivals. Catalan solids