Enneagrammic prism

9-2 enneagrammic prism

Type	Uniform polyhedron
Faces	2 enneagrams 9 squares
Edges	27
Vertices	18
Vertex configuration	⁹/₂.4.4
Wythoff symbol	2 9/2 \| 2
Symmetry group	D_9h, [2,9],(*299), order 36
Dual polyhedron	Enneagrammic bipyramid
Properties	nonconvex
Vertex figure

9-4 enneagrammic prism

Type	Uniform polyhedron
Faces	2 enneagrams 9 squares
Edges	27
Vertices	18
Vertex configuration	⁹/₄.4.4
Wythoff symbol	2 9/4 \| 2
Symmetry group	D_9h, [2,9],(*299), order 36
Dual polyhedron	Enneagrammic bipyramid
Properties	nonconvex
Vertex figure

In geometry, the enneagrammic prism is a nonconvex prisms formed by squares sides and two regular star polygon caps. There are two forms based on the two types of enneagrams: {9/2} and {9/4}.

Sources

Antiduoprisms at polytope.net
A128112 at oeis.org

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