The tilaka (or tilak) is a mark worn on the forehead or other parts of the body as a sign of spiritual devotion. Hindus may wear a tilaka regularly or especially on religious occasions. The shape of the tilaka is often an indicator of devotion to a certain deity. For example, a 'U' shape tilaka usually denotes devotion to Vishnu, while Shiva devotees often wear it in the form of three horizontal lines. It may be made of saffron, vermilion, turmeric, clay or simply ash.