Enneagrammic prism
In geometry, the enneagrammic prism is a nonconvex prism formed by square sides and two regular enneagram caps. There are two forms based on the two types of enneagrams: {9⁄2} and {9⁄4}.
| 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 | D9h, [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 | D9h, [2,9],(*299), order 36 |
| Dual polyhedron | Enneagrammic bipyramid |
| Properties | nonconvex |
| Vertex figure | |
 | |
3D model of a (uniform) {9⁄2} prism
3D model of a (uniform) {9⁄4} prism
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