Octagrammic prism

The octagrammic prism, or stop, is a prismatic uniform polyhedron. It consists of 2 octagrams and 8 squares. Each vertex joins one octagram and two squares. As the name suggests, it is a prism based on an octagram.

Similar to how an octagonal prism can be vertex-inscribed into the small rhombicuboctahedron, an octagrammic prism can be vertex inscribed into the quasirhombicuboctahedron.

Vertex coordinates
An octagrammic prism of edge length 1 has vertex coordinates given by:
 * (±1/2, ±($\sqrt{(5–2√2)/2}$–1)/2, ±1/2),
 * (±($\sqrt{2}$–1)/2, ±1/2, ±1/2).

Representations
An octagrammic prism has the following Coxeter diagrams:


 * x x8/3o (full symmetry)
 * x x4/3x (base has BC2 symmetry)