I think it's a Nordic/viking symbol.

Edit: what I got from a quick Brave search actually makes sense:

"It is believed to represent fertility and rebirth, as well as the power of Viking practitioners and shamanists who were said to be able control people’s minds and bind their fates."

Hence his nickname and viking horns.

I think it's a Nordic/viking symbol.

Edit: what I got from a quick Brave search actually makes sense:

"It is believed to represent fertility and rebirth, as well as the power of Viking practitioners and shamanists who were said to be able control people’s minds and bind their fates."

Hence his nickname.