What does settlement hierarchy meanIn geography?

The hierarchy is to do with settlement. The bottom of the triangle is the things like Iscolated Houses. There isn't as many of them, and they are so small. Where as at the top of the triangle, there are Capital Cities. They are so much bigger and there is so much more of them, so settlement hierachyis basicly a triangle of most important (bigger and more) to least important (smaller and less)

i hope this helps ;) xxxxx