Polyhedron

In geometry, a polyhedron (plural polyhedra or polyhedrons; from Greek πολύ (poly-)  'many', and εδρον (-hedron)  'base, seat') is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices.

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Examples of polyhedra

Regular tetrahedron Platonic solid	Small stellated dodecahedron Kepler–Poinsot solid
Icosidodecahedron Archimedean solid	Great cubicuboctahedron Uniform star-polyhedron
Rhombic triacontahedron Catalan solid	A toroidal polyhedron

A convex polyhedron is the convex hull of finitely many points, not all on the same plane. Cubes and pyramids are examples of convex polyhedra.

A polyhedron is a 3-dimensional example of a polytope, a more general concept in any number of dimensions.