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A heptahedron is a seven-faced polyhedron. The number of pairs of parallel faces in a heptahedron can vary depending on its specific shape and configuration. For example, a regular heptahedron, such as a truncated triangular prism, may have pairs of parallel faces, while other irregular heptahedra may not have any. Therefore, the answer is not fixed and can range from zero to multiple pairs based on the specific heptahedron in question.
heptahedron
A heptagon has seven polygonal faces - sides that are plane.
heptahedron
It is a heptahedron. There are 34 topologically distinct convex heptahedra.