Roll the hair is a hairstyling technique used to create curls or waves in the hair. The term is derived from the action of rolling the hair around a curling iron or other tool to achieve the desired look. The SET crossword solution is an acronym for the three steps involved in this technique: Section, Twist, and Extend. Sectioning involves dividing the hair into small sections, twisting each section around the curling iron, and extending the curl by holding it in place for a few seconds. This technique can be used to create a variety of looks, from tight curls to loose waves.