The Johnson Solids
The Johnson solids are 3D polyhedra that are convex and have regular polygons for their faces, but are not among the Platonic solids or uniform 3D polyhedra. Norman Johnson enumerated the full list of 92 such polyhedra, which have been named after him.
The Johnson solids occur as cells of the so-called CRF polychora, a generalization of the Johnson solids to 4D.
Among the Johnson solids are:
- The square pyramid (J1);
- The pentagonal pyramid (J2);
- The triangular cupola (J3);
- The square cupola (J4);
- The pentagonal cupola (J5);
- The pentagonal rotunda (J6);
- The elongated square gyrobicupola (J37);
- The metabidiminished icosahedron (J62);
- The tridiminished icosahedron (J63);
- The bilunabirotunda (J91);
- The triangular hebesphenorotunda (J92).