Topknot
A bun or tuft of hair tied at the top of the head.
Also: top knot, man bun
A topknot is a knot or bun tied on the very top of the head. It is among the most widespread hairstyles in history: the Japanese chonmage of samurai and sumo wrestlers, the sangtu that married Korean men wore under their hats, the Sikh joora that holds uncut kesh, and many styles of South and Southeast Asia. In the 2010s a loose topknot, often called the man bun, became fashionable among men in the West.