Sikhism

Sikhism was a religion primarily associated with India. Its adherents were called Sikhs. They typically wore turbans, letting their hair grow long in a practice called Kesh. (TV: Brave-ish Heart, COMIC: The Crystal Throne, TV: For Tonight We Might Die, The Coach with the Dragon Tattoo) A kangha was an object important to their culture. (TV: Brave-ish Heart)

Ram Singh and his father Varun were Sikhs, but April MacLean noted that he wore his hair short. (TV: Brave-ish Heart) While Varun wore a turban, (TV: For Tonight We Might Die, The Coach with the Dragon Tattoo, et al.) which Ram appreciated as it reminded him of where he came from, Ram himself felt he needed to look "sharp" in "modern times". He also Ram pointed out, "Ever try going through airport security in a turban?" His dad didn't like that Ram did not practice Kesh. Ram still had a kangha that his father gave him. (TV: Brave-ish Heart)

The taxi drivers who drove the Seventh Doctor and Ace from Heathrow Airport to Smithwood Manor were Sikhs. (PROSE: Cat's Cradle: Warhead)

Donna Noble's cousin Janice was married to a Sikh. (PROSE: Ghosts of India)

Ajeeth, servant of Lady Cornelia Basildon-Stone, was a Sikh. (COMIC: The Crystal Throne)