The "Pentagrammic crossed-antiprism" is a type of polyhedron that belongs to the family of antiprisms. Specifically, it is a variation of the antiprism that involves a pentagram (a five-pointed star) instead of a regular polygon as its base faces. In geometrical terms, a crossed-antiprism consists of two parallel, congruent bases that are polygonal faces, connected by a set of triangular faces.

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