Thor's Hammer Mjolnir.
Silver necklace from the viking age, found in southern Iceland.
Thor’s hammer, Mjolnir, is the legendary magical weapon of Thor, the Norse God of Thunder and Lightning.
The symbol is a stylized representation of the weapon. It is said that Mjolnir always returned after it was thrown.
Today the Thor’s hammer is often worn by people to signify their Norse heritage and for protection.