Sikha

The sikha or shikha (Sanskrit: शिखा; IAST: śikhā; "crest"; Hindi चोटी (choTi)) means flame, powerful, ray of light, peak of a mountain. It is a name of Hindu / Indian origin, and is commonly used for females. It also means long tuft, or lock of hair, left on top or on the back of the shaven head of a male Orthodox Hindu. Though traditionally all Hindus were required to wear a śikhā, today it is seen mainly among Brahmins and temple priests.

Traditionally, Hindu men shave off all their hair as a child in a sanskāra or ritual known as the chudakarama. A lock of hair is left at the crown (sahasrara). Unlike most other eastern cultures (including ancient Egypt) where a coming-of-age ceremony removed childhood locks of hair similar to the śikhā (e.g. a forelock or pigtails in China, a topknot in Thailand, a sidelock in Egypt etc.) in India this prepubescent hairstyle is left to grow throughout the man's life, though usually only the most orthodox religious men will continue this hairstyle.

The śikhā is tied back or knotted to perform religious rites. Only funerals and death anniversaries are performed with the śikhā untied or with dishevelled hair. Dishevelled hair is considered inauspicious, and represents times of great sorrow or calamity. In Hindu scripture, Draupadi took an oath in the assembly of the Kurus after she was molested by Dushasana that she would remain with dishevelled hair until the enemies were properly revenged. Similarly, Chanakya is said to have taken an oath to leave his śikhā untied until he humbles the Nanda kings who insulted him.

...
Wikipedia