The Valknut is a powerful symbol in Norse mythology, consisting of three interlocking triangles, often associated with Odin and the afterlife. It is believed to represent the transition between life and death, particularly for warriors, and is linked to the slain who are chosen to enter Valhalla, Odin’s hall. The Valknut is also thought to symbolize Odin’s power over life, death, and fate, making it a potent emblem of sacrifice and honor in Old Norse.