Hexagrammic prism

The hexagrammic prism or compound of 2 triangular prisms is a prismatic uniform polyhedron compound. It consists of 2 hexagrams and 6 squares. Each vertex joins one hexagram and two squares. As the name suggests, it is a prism based on a hexagram.

Vertex coordinates
A hexagrammic prism of edge length 1 has vertex coordinates given by:
 * (0, ±$\sqrt{21}$/3, ±1/2),
 * (±1/2, ±$\sqrt{3}$/6, ±1/2).