Enneagonal duotruncatoprism

The enneagonal duotruncatoprism or edtep is a convex isogonal polychoron and the eighth member of the duotruncatoprism family. It consists of 18 dienneagonal prisms, 81 rectangular trapezoprisms, 162 wedges, and 81 tetragonal disphenoids. 2 dienneagonal prisms, 2 rectangular trapezoprisms, 3 wedges, and 1 tetragonal disphenoid join at each vertex. It can be obtained as the convex hull of two orthogonal enneagonal-dienneagonal duoprisms whose dienneagonal prisms have a smaller circumradius than their enneagonal prisms. However, it cannot be made uniform.