Sleipnir is a mythical eight-legged horse from Norse mythology. It is the steed of the god Odin and is said to be the fastest and strongest horse in the world. With its ability to travel between the realms of gods, humans, and the underworld, Sleipnir is often portrayed as a symbol of Odin's power and wisdom. In Norse mythology, Sleipnir helped Odin in various adventures, including the god's quest for knowledge and battles against giants and monsters.