- Octagrammic crossed-antiprism
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Octagrammic crossed-antiprism 
Type Uniform polyhedron Faces 2 Octagrams
16 trianglesEdges 32 Vertices 16 Vertex configuration 8/5.3.3.3 Wythoff symbol |2 2 8/5 Symmetry group D8d Dual polyhedron Octagrammic concave deltohedron Properties nonconvex Vertex figure 
In geometry, the octagrammic 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 octagrams.
It differs from the octagrammic antiprism by having opposite orientations on the two octagrams.
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