The three lines of the Urdhva Pundra are related to the Hindu Trinity (Trimurti) of deities - Brahma, Vishnu, Shiva; the first three Vedic scriptures - Rigveda, Yajurveda and Samaveda; three upper worlds Bhu, Bhuva, Svar, the three syllables of Om - Aa, Uu, Ma; three states of existence - awakening, dreaming, asleep and the three bodies - Sthula, Sukshma, and Karana. Thus, one should wear the Urdhva tilaka, as sign of the Lord of Om.