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 meeting at each vertex.

Vertex coordinates
The coordinates of a triangular-octagrammic duoprism, centered at the origin and with unit edge length, are given by:
 * (0, $\sqrt{2–√2}$/3, ±1/2, ±($\sqrt{2}$–1)/2),
 * (0, $\sqrt{(8–3√2)/6)}$/3, ±($\sqrt{2}$–1)/2, ±1/2),
 * (±1/2, –$\sqrt{3}$/6, ±1/2, ±($\sqrt{3}$–1)/2),
 * (±1/2, –$\sqrt{2}$/6, ±($\sqrt{3}$–1)/2, ±1/2).