In Norse mythology, Mjölnir is the mighty hammer wielded by Thor, the god of thunder, symbolizing strength, protection, and divine power. Forged by dwarves, Mjölnir was said to be so powerful that it could level mountains and was essential in Thor's battles against giants and other forces of chaos. As a symbol of protection, Mjölnir was also used in blessings and rituals, representing Thor’s role as the defender of both gods and humans.