Decagrammic antiprism
Type	Uniform polyhedron
Faces	2 Decagrams 20 triangles
Edges	40
Vertices	20
Vertex configuration	10⁄3.3.3.3
Wythoff symbol	-2 2 10⁄3
Symmetry group	D10d, [2+,20], (2*10), order 40
Dual polyhedron	Decagrammic deltohedron
Properties	nonconvex
Vertex figure

In geometry, the decagrammic antiprism is one in an infinite set of nonconvex antiprisms formed by triangle sides and two regular star polygon caps, in this case two decagrams.

• Prismatic uniform polyhedron

• Weisstein, Eric W. "Antiprism". MathWorld.
• Paper models of prisms and antiprisms