Phittih Kohnjuk is a ritual ceremony in which a small tuft of hair, called juk by the local population, is cut off and the head shaved (kohn) when boys reach the age of 11 or 13. The ceremony is generally regarded as a coming of age and in the past, this tradition was also upheld by royalty. At the time of his tonsure, a young prince destined for the throne would also be formally invested.

Seen here is Prince Pokklao, the later King Rama VII, at the day of his Tonsure Ceremony and Investiture, an elaborate form of the Thai topknot-cutting ceremony, reserved for royalty of phra ong chao (พระองค์เจ้า) rank and above, and  in Thai known as hra Racha Phittih Sokan (พระราชพิธีโสกันต์).