Small rhombic disoctachoron

{{Infobox polytope 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.
 * img = Sirdo.png
 * dim = 4
 * type = Uniform
 * obsa = Sirdo
 * off=Sirdo.off
 * symmetry = B{{sub|4}}, order 384
 * army = Srit
 * regiment = Srit
 * verf = Butterfly wedge, edge lengths 1 (bases), [{radic|2}} (ides of outer triangles), and $\sqrt{2+√2}$ (sides of inner triangles)
 * cells = 32 triangular prisms, 8 truncated cubes, 8 small rhombihexahedra
 * faces = 64 triangles, 96 squares, 48 octagons
 * edges = 96+192
 * vertices = 96
 * circum = $$\sqrt{2+\sqrt2} ≈ 1.84776$$
 * dich= Sroh–4–trip: $$\arccos\left(-\frac{\sqrt3}{3}\right) ≈ 125.26439°$$
 * dich2 = Sroh–8–tic: 90°
 * dich3 = Tic–3–trip: 90°
 * density =
 * euler = –32
 * pieces =
 * loc =
 * conjugate = Great rhombic disoctachoron
 * core=Tesseract
 * convex = No
 * orientable = No
 * nat = Tame}}

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.