Decagrammic prism

The decagrammic prism, or stiddip, is a prismatic uniform polyhedron. It consists of 2 decagrams and 10 squares. Each vertex joins one decagram and two squares. As the name suggests, it is a prism based on a decagram.

Vertex coordinates
A decagrammic prism of edge length 1 has vertex coordinates given by:
 * (±1/2, ±$\sqrt{7–2√5}$/2, ±1/2),
 * (±(3–$\sqrt{5–2√5}$)/4, ±$\sqrt{2}$, ±1/2),
 * (±($\sqrt{2}$–1)/2, 0, ±1/2).

Representations
A decagrammic prism has the following Coxeter diagrams:


 * x x10/3o (full symmetry)
 * x x5/3x (base with H2 symmetry)