What is the term used to describe the widest section of the head, starting at the temples and ending below the crown?

The term used to describe the widest section of the head, starting at the temples and ending below the crown, is the parietal ridge. This anatomical landmark is significant in both barbering and hairstyling as it helps to define the overall shape and structure of the head. By identifying the parietal ridge, barbers can more accurately create styles that proportionately balance the head's dimensions.

The parietal ridge marks an important reference point for haircuts, as it is where the shape of the hair changes from the more rounded areas of the crown to the flatter parietal areas. Understanding this area allows barbers to blend and shape haircuts more effectively, ensuring that styles are tailored properly to the client's head shape.

The other terms listed relate to different parts of the skull or head. The occipital ridge refers to the back of the head and the area where the skull meets the spinal column. The frontal bone is the forehead area, while the crown ridge isn't a recognized anatomical term in this context. Thus, the parietal ridge is the correct and most relevant term for the question regarding the widest section of the head.