Square-octagrammic duoprism

The square-octagrammic duoprism, also known as sistodip or the 4-8/3 duoprism, is a uniform duoprism that consists of 8 cubes and 4 octagrammic prisms, with 2 of each at each vertex.

The square-octagrammic duoprism can be vertex-inscribed into the great tesseractitesseractihexadecachoron.

Vertex coordinates
The coordinates of a square-octagrammic duoprism, centered at the origin and with unit edge length, are given by:
 * $$\left(±\frac12,\,±\frac12,\,±\frac12,\,±\frac{\sqrt2-1}2\right),$$
 * $$\left(±\frac12,\,±\frac12,\,±\frac{\sqrt2-1}2,\,±\frac12\right).$$

Representations
A square-octagrammic duoprism has the following Coxeter diagrams:
 * x4o x8/3o (full symmetry)
 * x x x8/3o (I2(8)×I×I symmetry, octagrammic prismatic prism)