That's the 'Bindi' - a fascinating form of body decoration. Hindus attach great importance to this ornamental mark on the forehead, often between the two eyebrows -- a spot considered a major nerve point in human body since ancient times. 'Bindi' is derived from the Sanskrit word 'bindu' or a drop, and suggests the mystic third eye of a person. It is also known as 'tika', 'pottu', 'sindoor', 'tilak', 'tilakam', and 'kumkum'.
The bindi is one of the most visually fascinating of all forms of body decoration. In southern India, girls choose to wear a bindi, while in other parts of India it is the prerogative of the married woman. A red dot on the forehead is an auspicious sign of marriage and guarantees the social status and sanctity of the institution of marriage.