What are the Different Types of Hair ? While it’s impossible to strictly categorise curl types as every individual’s hair is different, a number and letter system is often used as a guide and a starting point. Type 1: Straight hair. Type 2: Wavy hair. This type is divided into three – 2a, 2b and 2c depending on the intensity of the wave – 2a being least reminiscent of the letter S, and 2c the most. Type 3: Curly Hair. This type of hair is also divided into three – 3a, 3b and 3c. 3a being the loosest curl and 3c...