The
catoptric tessellation contain stereohedra cells.
Dihedral angles are integer divisors of 180°, and are colored by their order. The first three are the fundamental domains of {\tilde{C}}_3, {\tilde{B}}_3, and {\tilde{A}}_3 symmetry, represented by
Coxeter-Dynkin diagrams: , and . {\tilde{B}}_3 is a half symmetry of {\tilde{C}}_3, and {\tilde{A}}_3 is a quarter symmetry. Any space-filling stereohedra with symmetry elements can be
dissected into smaller identical cells which are also stereohedra. The name modifiers below, half, quarter, and eighth represent such dissections. Other convex polyhedra that are stereohedra but not parallelohedra nor plesiohedra include the
gyrobifastigium. == References==