A three-dimensional geometric solid that has eleven flat faces.
From Greek 'hendeca-' (eleven, from 'hen' one + 'deca' ten) plus 'hedron' (face, from 'hedra' seat). The term was created using Greek numerical prefixes when mathematicians needed names for polyhedra.
While Plato's five solids (tetrahedron, cube, octahedron, dodecahedron, icosahedron) are famous, hundreds of other polyhedra exist—but hendecahedra are so mathematically complex that they rarely appear in art or nature.
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