Question 1206: Warn-a bro(thers)

In medieval India, when the Rajputs were fighting off Muslim invasion, Rani Karnawati, the widow of the King of Chittor, was in distress, as the Sultan of Gujarat (Bahadur Shah) launched an attack on Chittor. In order to save the city, she asked for help from Humayun and sent a “X” to him. Humayun, touched by the gesture, sent his troops to save Chittor. Time was short and they arrived late, and by then, Rani Karnawati and the women of Chittor had tragically commited Jauhar (mass suicide).What is "X"?

Identify X. Answer: Rakhi, the thread a girl ties to her brother as a symbol of the Hindu festival Raksha Bandhan.