Lord Sheshnag is depicted is the divine serpent with a thousand heads.
According to Hindu mythology, the world rests on the hoods of Lord
Sheshnaga, and when he shakes his head, there are earthquakes. He is
also known as Ananta (eternal) since he is immortal and is not affected
by death even during the destruction of the Universe.Lord Vishnu reclines on the coils of Lord Sheshnag in the Ksheersagar, or the Ocean of Milk. Lord Sheshnag is also considered to be the soul of Lord Vishnu when he incarnated as Lord Balaram.