Mayapuri Gopi Chandan Tilaka Has Been Traditionally Interpreted As A Good Luck Charm. The Gopi Chandan/Tilak Mitti/Tilok Mati Has A Cooling Effect On The Forehead & This Can Assist In Concentration And Meditation. A Dot Between The Eyebrows Symbolizes The Third Eye Of Lord Shiva. Among Vaishnavites (Followers Of Vishnu), The Many Tilak Variations Usually Include Two Or More Vertical Lines Resembling The Letter U, Which Symbolizes The Foot Of Vishnu. There Is Sometimes A Central Line Or Dot.