Heptagonal antiprism

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. As a result, this polyhedron has 14 vertices, and 14 equilateral triangle faces. There are 14 edges where a triangle meets a heptagon, and another 14 edges where two triangles meet.

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	U77(e)
Dual	Heptagonal trapezohedron
Properties	convex
Vertex figure 3.3.3.7

The heptagonal antiprism was first depicted by Johannes Kepler, as an example of the general construction of antiprisms.^[1]