Study of those properties of geometric forms that remain invariant under certain transformations, such as bending or stretching. Whatever type of geometry is used, NURBS, or points, edges, and faces create it. The way these components are connected together and the flow around the 3D object is the topology.
(In cladistics) the layout of the cladogram.
In obstetrics, the relationship of the presenting fetal part to the pelvic outlet.