Triangular-octagrammic duoprism

The triangular-octagrammic duoprism, also known as tistodip or 3-8/3 duoprism, is a uniform duoprism that consists of 8 triangular prisms and 3 octagrammic prisms, with 2 of each at each vertex.

Vertex coordinates
The coordinates of a triangular-octagrammic duoprism, centered at the origin and with unit edge length, are given by:
 * $$\left(0,\,\frac{\sqrt3}3,\,±\frac12,\,±\frac{\sqrt2-1}2\right),$$
 * $$\left(0,\,\frac{\sqrt3}3,\,±\frac{\sqrt2-1}2,\,±\frac12\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}6,\,±\frac12,\,±\frac{\sqrt2-1}2\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}6,\,±\frac{\sqrt2-1}2,\,±\frac12\right).$$