The Ouroboros or Uroborus often represents self-reflexivity or cyclicality, especially in the sense of something constantly re-creating itself, the eternal return, and other things perceived as cycles that begin anew as soon as they end (compare Phoenix).
Know your Vegvisirs. I was drawing these, wondered why the different versions around the place. Nobody can figure out what Björks tattoo actually is, a Galdrabók one roughly done most likely vegvisir symbol
Huginn and Muninn Shirt. Huginn and Muninn, sometimes Anglicized Hugin and Munin, are a pair of ravens associated with the Norse god Odin. Hugin and Munin travel the world bearing news and information to Odin.
NN Vegvisir - The Icelandic word literally means ‘guidepost’: It is a Norse protection symbol, intended to help the bearer find their way through bad weather. ”if this sign is carried, one will never lose one’s way… even when the way is not known”