Plural of heptahedron; multiple three-dimensional geometric solids, each having seven faces.
From Greek 'hepta' (seven) + 'hedra' (face or side), with Latin plural '-a'. Used in geometry and mathematics to describe polyhedra.
Heptahedra are surprisingly rare in nature and mathematics compared to cubes or tetrahedrons—but when they appear in crystal structures, they often indicate special chemical or physical properties!
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