The Nishan Sahib is a Sikh holy flag, Sikh parcham, Nishaan E Khalsa, made of cotton or silk cloth and is generally triangular in shape. It was hoisted for the first time at Akal Takhat Sahib in the year 1609. Nishan Sahib is placed outside every Sikh Gurdwara and is supported by a pole of timber or metal. The Khanda, a Sikh symbol, is rendered in blue on the saffron background. The khanda is placed high up on a flagpole.Great respect is shown to this flag which is shown by its washing using milk and water every year. The sikhs bow the head in front of the Nishan Sahib when ever they visit any Gurdwara.