What is the face lattice of a convex polytope

The face poset $FL(P)$ of a convex polyhedron is the set of all faces of $P$ ordered by set inclusion. Two polytopes are called isomorphic if their face posets are isomorphic. The face poset of a convex polytope is a lattice.

The face poset of a convex polyhedron is sometimes referred to as the combinatorial structure of the polyhedron. Thus the expression ``two polyhedra are combinatorially equal'' means they are isomorphic.