What is the area between straight and curved partings within a shape, or the section of the hair where the roller, thermal iron or round brush is placed called?

The area between straight and curved partings within a shape, where tools like rollers, thermal irons, or round brushes are applied, is known as the base. The base is crucial as it determines the stability and support of the hairstyle. It is the section of hair directly attached to the scalp and is typically where the tool is placed to create curls or waves. Having a well-defined base allows for better control and manipulation of the hair, leading to optimal styling results.

While terms like "stem" and "volume" relate to different aspects of hairstyling—such as the length of hair between the base and the first turn of a curl, and the overall fullness of the hairstyle—neither refers specifically to the area in question where tools operate. Tool diameter refers to the size of the tool itself and does not describe the specific area of hair being styled. Understanding this distinction is essential for effective hair styling techniques.