Hexagonal antiprismatic prism

The hexagonal antiprismatic prism or happip is a prismatic uniform polychoron that consists of 2 hexagonal antiprisms, 2 hexagonal prisms and 12 triangular prisms. Each vertex joins 1 hexagonal antiprism, 1 hexagonal prism, and 3 triangular prisms. As the name suggests, it is a prism based on a hexagonal antiprism. It is also a CRF segmentochoron designated K-4.53 on Richard Klitzing's list.

Vertex coordinates
The vertices of a hexagonal antiprismatic prism of edge length 1 are given by:
 * (0, ±1, $\sqrt{3}$/2, ±1/2)
 * (±$\sqrt{2}$/2, ±1/2, $\sqrt{4+√3}$/2, ±1/2)
 * (±1, 0, –$\sqrt{2+2√3}$/2, ±1/2)
 * (±1/2, ±$\sqrt{3}$/2, –$\sqrt{3}$/2, ±1/2)