Vishnu is the supreme deity of Vaishnavism, revered as the preserver and protector within the Hindu Trimurti, alongside Brahma and Shiva. His primary role is to maintain cosmic order (dharma) and intervene through avatars when adharma prevails. The Vishnu Purana (1.2.1) describes him as the ultimate reality, the source of all creation, and the sustainer of the universe. The Bhagavata Purana (1.2.11) states, 'vadanti tat tattva-vidas tattvam yaj jnanam advayam brahmeti paramatmeti bhagavan iti sabdyate,' identifying Vishnu with Brahman and Paramatman. His ten principal avatars (Dashavatara) are enumerated in the Garuda Purana (1.86.10-11), including Matsya, Kurma, Varaha, Narasimha, Vamana, Parashurama, Rama, Krishna, Buddha, and Kalki.
The Vishnu Sahasranama, found in the Mahabharata (Anushasana Parva 149), lists a thousand names of Vishnu, each revealing an aspect of his divine attributes. The mantra 'Om Namo Narayanaya' is a prominent eight-syllable mantra (ashtakshara) from the Taittiriya Aranyaka (10.1.1), invoking Vishnu as Narayana, the refuge of all beings. The Vishnu Gayatri, 'Om Narayanaya vidmahe Vasudevaya dhimahi tanno Vishnuh prachodayat,' is chanted for wisdom and protection. The beej mantra 'Om' is central, representing the primordial sound. Chanting these mantras is traditionally done during Brahma Muhurta (pre-dawn), facing east, with a japa mala of 108 beads.
The Vishnu Sahasranama is often recited on Ekadashi and during Vishu or Vaikuntha Ekadashi for liberation (moksha). According to the Shandilya Upanishad (1.1), meditation on Vishnu leads to self-realization. Cautions include maintaining purity of body and mind, avoiding chanting during impurity (e.g., after meals without washing), and respecting the guru's guidance for initiation into the ashtakshara mantra. Vishnu's iconography—blue complexion, four arms holding shankha, chakra, gada, and padma—symbolizes his cosmic functions: the conch for the primordial sound, discus for the mind, mace for strength, and lotus for liberation. He is often depicted reclining on the serpent Shesha in the cosmic ocean, as described in the Bhagavata Purana (2.10.10).
Worship of Vishnu is pan-Indian and extends to Nepal, Sri Lanka, and Southeast Asia, with festivals like Rama Navami and Krishna Janmashtami celebrating his avatars.
Om, salutations to Narayana (Vishnu).
The mantra begins with the seed-syllable 'Om', which is the primordial sound representing the ultimate reality.