what anime symbols do you like the most?

-Ouroboros, Asclepius, some transmutation circles and Scar's tattoo from FMA.
-the X-LAWS cross from Shaman King.
-Seele eyes logo and the tree of Sephiroth from NGE.
-The Dragon crest from Daibouken no Dai.
I think those are the ones I like the most. Maybe I left many others out of the list but those were the ones I liked the most.

Now I remember another symbol. Alexander Anderson's glove's symbols in Hellsing.

The SEELE mask with eyes and the SOS団 logo.