Which term describes the angle at which the rod is positioned on the head?

The term that describes the angle at which the rod is positioned on the head is indeed base direction. This concept focuses on how the hair is wrapped around the rod during techniques such as perming or setting styles. The angle influences the curl formation and the overall result of the hairstyle.

Base direction not only contributes to the end curl pattern but also affects the volume and how the curls blend with the rest of the hair. Understanding base direction helps stylists achieve precise results tailored to the client's desired look.

In contrast, base placement refers to the specific manner in which the sections of hair are set on the roller or rod, and curl direction pertains to the way curls are styled or fall. Rod angle, while relevant to curling techniques, is not the commonly used term for describing the positioning of the rod on the head in the context of hair styling.