A turban was a type of headwear, worn by Sikhs. It was a part of Kesh. (TV: Brave-ish Heart)
The Cyberman Bremm wore a turban when playing the Silver Turk. (AUDIO: The Silver Turk)
Varun Singh wore one at all times. (TV: For Tonight We Might Die, The Coach with the Dragon Tattoo, Brave-ish Heart )
Bulbir Singh Mann wore a red turban. (PROSE: The Pit)