Fissary

A polytope is **fissary** if it contains compound figures, such as vertex figures, edge figures, etc. A polyhedron is fissary when it has compound vertex figures. A polychoron is fissary when it has compound vertex or edge figures. A n-polytope is fissary if it has any compound m-dimensional figures where m ranges from 0 to n-3.

The only fissary uniform polyhedra are the compounds. The first dimension to feature fissary uniform figures that are not compounds is 4, such as Sitphi (vertex fissary) and Dupti (edge fissary).

Fissary uniform figures may or may not be excluded from the total list of uniform figures in a given dimension, unlike exotic (having compound ridges or n-2 figures), exotic-celled, and 'coincidic' (having two or more facets of the same regiment lying on the same space). However, fissaries dominate the uniform figures in high dimensions.