Lord Vishnu is the all-pervasive Lord who expands into everything. He is the maintainer of the universe and the complete cosmic creation. He is called Vishnu because He overcomes all.1 He represents sattva-guna, or the mode of goodness by which everything is sustained.
Vishnu is blue coloured and has four or more hands. He is shown holding two of his most characteristic symbols: the wheel and the conch-shell. He is always clothed in yellow. The wheel represents the Universal Mind and the powers of creation and destruction that form the revolving universe. The conch-shell is associated with the origin of existence through its spiral form and it connection with water. Vishnu also holds the club which symbolizes authority or the power of knowledge as the essence of life. He has an open upraised palm in the abhaya mudra, expressing reassurance. He sometimes holds a lotus and is also known as Narayan.
Vishnu is normally shown reclining on a bed made up of the coils of the serpent king, Sheshanaga, with Lakshmi/Shri, his consort, seated at his feet. Brahma is shown to have been born from a lotus springing from the navel of Vishnu. According to Hindu mythology a cosmological substance is left over from the last age of creation from which a new cycle may be brought into existence. This is symbolized by the many-headed serpent king. Shesha means the leftover floating on the ocean which is thought to be like the Universe.
During the interval in the cycle of creation, Vishnu lies asleep on the coils of Sheshanaga, protected by its hood, until he is ready to begin a new cycle.