9-3 step prism

The 9-3 step prism is a convex isogonal polychoron, member of the step prism family. It has 3 triangular antiprisms and 9 phyllic disphenoids as cells.

Isogonal derivatives
Substitution by vertices of these following elements will produce these convex isogonal polychora:
 * Phyllic disphenoid (9): 9-3 step prism
 * Scalene triangle (9): 9-3 step prism
 * Scalene triangle (18): 18-3 step prism
 * Edge (9): 9-3 step prism