17-4 gyrochoron

The 17-4 gyrochoron, also known as the rocky 17, is a convex isochoric polychoron and member of the gyrochoron family with 17 paratetratruncated truncated tetragonal disphenoids as cells.

Each cell of this polychoron has BC2+×A1+ symmetry, with 4 octagonal, 4 tetragonal, and 4 triangular faces.

Compared to other gyrochora with 17 cells, this polychoron has doubled symmetry, because 17 = 42+1.