A system of defining curl patterns found in the shafts of loose natural hair. One popular method of curl typology was developed by Hollywood stylist Andre Walker in his book Andre Talks Hair. In Walker Hair Typology, basic curl shapes are defined with a number (1-4), and the coarseness of the hair strands is defined with a letter (a, b, or c).

Walker’s hair typology is controversial in natural hair communities focused on unlocked hair because some people believe its labels are divisive and don’t have have any bearing on brushable hair care. These people emphasize the importance of other physiological aspects of hair, such as cuticle porosity. However, when it comes to locks, curl pattern hugely affects which starting and maintenance methods are best for an individual.