Small rhombic disoctachoron

The small rhombic disoctachoron, or sirdo, is a nonconvex uniform polychoron that consists of 8 truncated cubes, 8 small rhombihexahedra, and 32 triangular prisms. 2 of each type of cell join at each vertex.

It can be constructed as a blend of four truncated cubic prisms. In the process the octagonal prisms blend into small rhombihexahedra.

Vertex coordinates
The vertices are the same as those of the regiment colonel, the small rhombated tesseract.