Grand hendecagrammic prism

The grand hendecagrammic prism or gashenp is a prismatic uniform polyhedron. It consists of 2 grand hendecagrams and 11 squares. Each vertex joins one grand hendecagram and two squares. As the name suggests, it is a prism based on a grand hendecagram.

Vertex coordinates
The coordinates of a grand hendecagrammic prism, centered at the origin and with edge length 2sin(5π/11), are given by:
 * (1, 0, ±sin(5π/11)),
 * (cos(2π/11), ±sin(2π/11), ±sin(5π/11)),
 * (cos(4π/11), ±sin(4π/11), ±sin(5π/11)),
 * (cos(6π/11), ±sin(6π/11), ±sin(5π/11)),
 * (cos(8π/11), ±sin(8π/11), ±sin(5π/11)),
 * (cos(10π/11), ±sin(10π/11), ±sin(5π/11)).