Octagonal-hendecagonal duoprism

The octagonal-hendecagonal duoprism or ohendip, also known as the 8-11 duoprism, is a uniform duoprism that consists of 8 hendecagonal prisms and 11 octagonal prisms, with two of each joining at each vertex.

Vertex coordinates
The coordinates of an octagonal-hendecagonal duoprism, centered at the origin and with edge length 2sin(π/11), are given by: where j = 2, 4, 6, 8, 10.
 * $$\left(±\sin\frac\pi{11},±(1+\sqrt2)\sin\frac\pi{11},1,0\right),$$
 * $$\left(±\sin\frac\pi{11},±(1+\sqrt2)\sin\frac\pi{11},\cos\left(\frac{j\pi}{11}\right),±\sin\left(\frac{j\pi}{11}\right)\right),$$
 * $$\left(±(1+\sqrt2)\sin\frac\pi{11},±\sin\frac\pi{11},1,0\right),$$
 * $$\left(±(1+\sqrt2)\sin\frac\pi{11},±\sin\frac\pi{11},\cos\left(\frac{j\pi}{11}\right),±\sin\left(\frac{j\pi}{11}\right)\right),$$

Representations
An octagonal-hendecagonal duoprism has the following Coxeter diagrams:
 * x8o x11o (full symmetry)
 * x4x x11o (octagons as ditetragons)