Mjolnir (also Mjöllnir) was both thunder-god Thor’s preferred weapon and the means by which he granted blessings.
As a symbol, it was widely in use during the Viking era, and versions of it were often worn or carried as talismans by the Vikings, who certainly would have wanted to call upon Thor’s strength, protection, and skill in battle.
According to Norse mythology, the dwarf Brokkr forged Mjolnir. The dwarves were known for their excellent and magical forging works.