A collection of Faces of an -D Polytope or Simplicial Complex, one of each Dimension 0, 1, ..., , which all have a common nonempty Intersection. In normal 3-D, the flag consists of a half-plane, its bounding Ray, and the Ray's endpoint.
-D Polytope or Simplicial Complex, one of each
Dimension 0, 1, ..., 
, which all have a common nonempty Intersection. In normal 3-D, the
flag consists of a half-plane, its bounding Ray, and the Ray's endpoint.