Thor's hammer, known as Mjölnir, is a powerful weapon in Norse mythology. It is associated with Thor, the god of thunder, and is said to be capable of leveling mountains and defeating giants. Mjölnir is often depicted as a short-handled hammer, symbolizing protection and blessing. In addition to its destructive power, Mjölnir is also a tool for rituals, such as weddings and funerals. It represents the strength and resilience of Thor and is a significant symbol in Norse culture, often seen in art and jewelry today.