Hendecagonal-hendecagrammic duoprism

The hendecagonal-hendecagrammic duoprism, also known as the 11-11/3 duoprism, is a uniform duoprism that consists of 11 hendecagonal prisms and 11 hendecagrammic prisms, with 2 of each at each vertex.

The name can also refer to the hendecagonal-small hendecagrammic duoprism, the hendecagonal-great hendecagrammic duoprism, or the hendecagonal-grand hendecagrammic duoprism.

Vertex coordinates
The coordinates of a hendecagonal-hendecagrammic duoprism, centered at the origin and with edge length 4sin(π/11)sin(3π/11), are given by: where j, k = 2, 4, 6, 8, 10.
 * $$\left(2\sin\frac{\pi}{11},\,0,\,2\sin\frac{3\pi}{11},\,0\right),$$
 * $$\left(2\sin\frac{\pi}{11},\,0,\,2\sin\frac{3\pi}{11}\cos\left(\frac{k\pi}{11}\right),\,±2\sin\frac{3\pi}{11}\sin\left(\frac{k\pi}{11}\right)\right),$$
 * $$\left(2\sin\frac{\pi}{11}\cos\left(\frac{j\pi}{11}\right),\,±2\sin\frac{\pi}{11}\sin\left(\frac{j\pi}{11}\right),\,2\sin\frac{3\pi}{11},\,0\right),$$
 * $$\left(2\sin\frac{\pi}{11}\cos\left(\frac{j\pi}{11}\right),\,±2\sin\frac{\pi}{11}\sin\left(\frac{j\pi}{11}\right),\,2\sin\frac{3\pi}{11}\cos\left(\frac{k\pi}{11}\right),\,±2\sin\frac{3\pi}{11}\sin\left(\frac{k\pi}{11}\right)\right),$$