Heptahedron

A heptahedron (pl.: heptahedra) is a polyhedron having seven sides, or faces.

A heptahedron can take a large number of different basic forms, or topologies. The most familiar are the hexagonal pyramid and the pentagonal prism. Also notable is the tetrahemihexahedron, which can be seen as a tessellation of the real projective plane. No heptahedra are regular.

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