| Uniform heptagonal antiprism | |
|---|---|
 | |
| Type | Prismatic uniform polyhedron |
| Elements | F = 16, E = 28 V = 14 (χ = 2) |
| Faces by sides | 14{3}+2{7} |
| Schläfli symbol | s{2,14} sr{2,7} |
| Wythoff symbol | | 2 2 7 |
| Coxeter diagram |      |
| Symmetry group | D7d, [2+,14], (2*7), order 28 |
| Rotation group | D7, [7,2]+, (722), order 14 |
| References | U 77(e) |
| Dual | Heptagonal trapezohedron |
| Properties | convex |
 Vertex figure 3.3.3.7 | |
In geometry, the heptagonal antiprism is the fifth in an infinite set of antiprisms formed by two parallel polygons separated by a strip of triangles. In the case of the heptagonal antiprism, the caps are two regular heptagons. Consequently, this polyhedron features 14 vertices and 14 equilateral triangular faces. There are 14 edges where a triangle meets a heptagon, and an additional 14 edges where two triangles meet.
The heptagonal antiprism was first illustrated by Johannes Kepler as an example of the general construction of antiprisms. [1]
