Sigil of Amon street art

It looks as though someone was summoning Amon on the North Street bridge.

For the record:
"AMON, a strong and powerful marquis, who appears like a wolf with a serpent's head, and vomiting flame.  When so ordered, he assumes a human shape, but with the teeth of a dog.  He discerns past and future, procures love, and reconciles friends and foes."