Crown
The top and back of the head, where the hair usually grows outwards from a whorl.
Also: vertex
The crown is the highest point at the back of the head. Hair there often grows in a spiral from a whorl, so it can stand up or split apart after a short cut. Barbers leave a little more length at the crown, or blend it carefully, so it lies flat. In updos the crown is where volume is built by backcombing, and in many braided styles it is the point the braids start from or circle around.