In Norse mythology, there lived a great beast. A wolf, but not just any wolf. This wolf is the son of Loki (how a humanoid fathers a wolf I surely don't know, but it's mythology so we won't overthink it) and the father of ALL wolves.
The legend of Fenrir has many interesting stories attached to it, but perhaps the most well known is how Fenrir came to bite off the hand of the Nordic god, Týr (from whom we get "Týrsday, or Tuesday as it is now known). Týr was brave enough to place his hand INSIDE the mouth of Fenrir while the other Nordic god's bound Fenrir with a magical ribbon made by the dwarves. Fenrir, who was able to break every other chain up until the magical dwarf ribbon was unable to free himself, and bit off Týr's hand in a rage! Týr is now most commonly depicted as missing a hand.
Fenrir will remain bound by the magical dwarf ribbon seething, his anger growing, until Ragnarök (the Nordic version of the Armageddon and end of days). At which point he will break free and swallow Odin, the god of gods, WHOLE (bad wolf! No treat for you)! This symbol has been interpreted as the idea of darkness taking over the light.
The design depicts this monstrous canine of Northern European lore in a classic Nordic style with knots and patterns everywhere, but with a contemporary twist. The colors are distressed to give an aged appearance almost as if it's a gold or bronze artifact that was dug out of a Scandinavian chieftain's burial mound. The runes at the bottom of the design say "Fenrir".