 Its symmetry is written as "p"["q"]"r", called a "Shephard group", analogous to a Coxeter group, while also allowing unitary reflections.For nonstarry groups, the order of the group "p"["q"]"r" can be computed as formula_9.The Coxeter number for "p"["q"]"r" is formula_10, so the group order can also be computed as formula_11.