Mjölnir

Mjölnir (Old Norse, possibly “crusher” or connected to the word for “lightning”) is the hammer of Thor, son of Odin and Jörð, and the primary symbol of Norse religion both ancient and modern. In the mythological sources it serves as a weapon against the jötnar; in the cultic sources it serves as a hallowing instrument; in both functions it embodies Thor’s essential role as protector of the cosmic and social order.

The forging

Skáldskaparmál ch. 35 tells the story. Loki, after cutting off Sif’s golden hair as a prank, was compelled to commission replacement treasures from the dwarfs. He went first to the sons of Ívaldi, who made Sif’s golden hair, the spear Gungnir, and Freyr’s ship Skíðblaðnir. Then, wagering his own head, Loki bet the dwarf Brokkr that he and his brother Sindri could not make three treasures equal to those. Sindri and Brokkr forged Draupnir (Odin’s gold ring), Gullinbursti (Freyr’s golden boar), and Mjölnir. But Loki — transforming into a fly — bit Brokkr’s eyelid as he worked the bellows, causing the handle to come out short. Despite this flaw, when the gods judged all six treasures, they declared Mjölnir the greatest of all, because “the Æsir’s greatest need is a weapon against the frost-giants.”

Hallowing

Þrymskviða provides the ritual function: when the giant Þrymr demands Mjölnir be brought to hallow the wedding — specifically to hallow the bride Freyja — he reveals the hammer’s cultic role. Thor, disguised as Freyja, retrieves Mjölnir by playing along until it is placed in the “bride’s” lap and then seizes it to kill Þrymr and his kin. The hammer hallows weddings, newborns, and the dead in the Norse corpus, and it hallows sacred space at the start of blót even today.

The Mjölnir sign

Modern Ásatrú practitioners use the hammer-sign — tracing an inverted T in the air — to hallow space before ritual, directly paralleling the staves of consecration described in the sources.