The "ocean of milk" is a concept from Hindu mythology, specifically in the story of the churning of the ocean. It describes a vast, mythical sea of milk that was churned by the gods and demons to obtain the nectar of immortality. This event is known as Samudra Manthan and symbolizes the struggle between good and evil. In this tale, the gods and demons used the serpent Vasuki as a rope to churn the ocean, with Mount Mandara serving as the churning rod. The ocean of milk is rich in symbolism, representing the potential for creation and the quest for enlightenment.