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A heptahedron is a closed 3-d shape with 7 polygonal faces. There are 34 topologically different convex heptahedra and, since none of these are regular, the term is ambiguous. There can be:no parallel edges,five pairs of parallel edges and two quintet,three quartets,two pairs and one tripletas well as many other combinations.
A cuboid has 3 pairs of parallel faces.
A rectangular prism has six faces, and each pair of opposite faces is parallel to each other. Therefore, a rectangular prism has three pairs of parallel faces.
3 pairs
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