Face

The intersection of an $n$-D Polytope with a tangent Hyperplane. 0-D faces are known as Vertices (nodes), 1-D faces as Edges, $(n-2)$-D faces as Ridges, and $(n-1)$-D faces as Facets.

See also Edge (Polyhedron), Facet, Polytope, Ridge, Vertex (Polyhedron)