Small 13-5 bigyrochoron

The 13-5 bigyrochoron is a convex isochoric polychoron with 26 order-8 truncated digonal-octagonal gyronotches as cells.

Isogonal derivatives
Substitution by vertices of these following elements will produce these convex isogonal polychora:
 * Order-8 truncated digonal-octagonal gyronotch (26): 13-5 double step prism
 * Rectangular-symmetric octagon (13): 13-5 step prism
 * Mirror-symmetric pentagon (26): 13-5 double step prism
 * Edge (26): 13-5 double step prism
 * Vertex (13): 13-5 step prism
 * Vertex (26): 13-5 double step prism