Former students of the Doon School are known as Doscos. Rajiv Gandhi and his brother Sanjay, ThePrint writes, “brought this elite network of ‘Doscos’ into vogue in politics.” Arun Singh, from the school’s 1959 batch, served in Rajiv Gandhi’s cabinet.
In January 1985 the Christian Science Monitor described two men around the new prime minister: “One is a trusted cousin. The other, a former schoolmate.” The cousin was Arun Nehru. The schoolmate was Arun Singh.