Ouroboros (the self-devouring snake/dragon) is an old world symbol, present in many cultures from ancient Egypt and Greece to old Norse to the Middle Ages. It's also a symbol tied to alchemy.
http://en.wikipedia.org/wiki/Ouroboros
Also, there is this Norse reference to a goddess, Eir. (She's like a valkyrie Florence Nightengale.)
http://en.wikipedia.org/wiki/Eir
And then NeoGAF had this to add (found in "the page source")