This is a magical weapon known as Odin’s spear or Javelin. Like Mjolnir, the magical hammer belonging to Odin, Gungnir-whose name means ‘The Unwavering One’- has two very practical qualities that render it an essential tool in the arsenal of the powerful thunder god. It always hits it mark and always returns, like a boomerang back to the thrower. As well as being a sacred object, there is a runic symbol, Gar that also represents the Gungnir.
Nozedar Adele, The element encyclopaedia of secret signs and symbols, 2008, Gungnir, p 100