Vibhuti
Sacred ash used in Hindu worship and smeared on the forehead, especially by devotees of Shiva.
Also: bhasma, holy ash
Vibhuti is ash, traditionally made by burning dried cow dung or wood in ritual fires, and given out in many temples, especially those of Shiva. Worshippers smear it on the forehead, often as the three lines of the tripundra. It is a reminder, by tradition, of impermanence. In South India it is commonly worn by people of all ages after temple visits.