Sif's Sword and Shield

"Give me my sword, Lorelei."

- Sif

Lady Sif used a double-bladed sword as her weapon of choice.

History
The sword of Sif was forged from Asgardian metal, and possessed two-blades, giving it the appearance of a staff. The sword was quite useful in battle, so much that Lorelei, Sif's nemesis, desired it for her own.

When Sif accompanied Thor to Jotunheim, she used her sword excessively in the skirmish, cutting down numerous Frost Giants. It was also used later in the battle against the Destroyer in New Mexico, with Sif impaling the Destroyer through the throat with little effect.

Years later, Sif traveled to Earth to apprehend and escaped Lorelei, and during their conflict with each other, Lorelei sought to take the sword for herself. The bout between the two maidens broke the sword in half, and in the ensuing duel, Sif defeated Lorelei and reclaimed the stolen half.

Trivia

 * In the comics, Sif possessed a plain, single-bladed sword.