>>42629980
Considering the fact that I'm discussing a children's show about friendship and magic with people who can't tell the difference between a unicursal hexagram and the star of david, I think wikipedia is a good starting point. Incidentally, that symbol can also be seen in yu-gi-oh, where it's called "the seal of orichalcos".
Due the nature of the subject, most other potential sources are weird occult web pages, which aren't exactly scholarly either, so I'm sure you'll pardon my casual misuse of citation, "bro".