A three-dimensional geometric solid having seven flat faces or sides.
From Greek 'hepta' (seven) + 'hedron' (face). Used since ancient times in geometry, though less common than shapes with four, six, or eight faces.
Heptahedrons are mysteriously underrepresented in nature—mathematicians have found only a few ways to arrange seven faces into closed solids, making them less 'natural' than hexahedrons or octahedrons!
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