Heptagrammic crossed-antiprism
| Heptagrammic crossed-antiprism | |
|---|---|
 | |
| Type | Uniform polyhedron |
| Faces |
2 Heptagrams 14 triangles |
| Edges | 28 |
| Vertices | 14 |
| Vertex configuration | 7/4.3.3.3 |
| Wythoff symbol | |2 2 7/4 |
| Symmetry group | D7d |
| Dual polyhedron | Heptagrammic concave deltohedron |
| Properties | nonconvex |
| Vertex figure | |
 | |
In geometry, the heptagrammic crossed-antiprism is one in an infinite set of nonconvex antiprisms formed by triangle sides and two regular star polygon caps, in this case two {7/3} heptagrams.
It differs from the heptagrammic antiprism (7/3) by having opposite orientations on the two heptagrams.