The serpent that encircles the Earth in Norse mythology is called Jörmungandr. It is known as the World Serpent and is a child of the god Loki. According to the myths, Jörmungandr and the god Thor are destined to confront each other during Ragnarök, the end of the world. This creature represents boundaries and the cyclical nature of existence. Jörmungandr's immense size and its encircling of the Earth signify the interconnectedness of life, chaos, and the forces of nature. Its eventual battle with Thor is a crucial aspect of Norse eschatology.