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A heptahedron is a polyhedron which has $7$ faces.

Linguistic Note

The word heptahedron derives from the Classical Greek ἑπτάεδρόν:

hepta (ἑπτά), meaning seven
hedron (a form of ἕδρα), meaning base or seat.

The technically correct plural of heptahedron is heptahedra, but the word heptahedrons can often be found.