Topology is the term which describes flow of polygons.

There is also term called ISO lines, those are actually lines (edges) of low-poly cage "projected" on sub-divided mesh.

On the example above, see how polygons "flow" nicely around eye socket, lips, etc, that is a good topology (very important for face expressions, pozing and animation, or at least, that is what everybody is saying, lol)! :D

One other thing, they all are reccomending (the big heads, lol) that 4 sided polys should dominate every model...go figure, hehe :D