Non-convex set A set that is not convex is called a non-convex set. A polygon that is not a convex polygon is sometimes called a concave polygon,. and some sources more generally use the term concave set to mean a non-convex set, but most authorities prohibit this usage.
non-convex set a set that is not convex is called a non-convex set a polygon that is not a convex polygon is sometimes called a concave polygon and some sources more generally use the term concave set to mean a non-convex set but most authorities prohibit this usage