The serpent-like creature that is a significant myth in Norse and Germanic mythology is known as the Jörmungandr, or the Midgard Serpent. According to legends, it is so large that it encircles the Earth, and its confrontation with Thor during Ragnarok is one of the pivotal events in Norse mythology. Jörmungandr symbolizes chaos and the threat to order, showcasing the elements of fate and destiny prevalent in these ancient tales.