On another of my myrid worlds, this is a binding symbol that the people use to bind spirits. Typically its placed on a choker type necklace made of seed bead type beads, other times its tattooed onto a wrist, sometimes both. In either case, it's surrounded by four colors representing air, fire, water, and earth, and there's usually somewhere a special type of gold they call the 'gold of truth' which is magical in nature. The basic chant they use is 'By water, fire, earth, and air I summon thee, by the gold of truth I command thee, and to the eye I bind ye.' Usually saying the name of the spirit that they're binding after that. These spirits are the only true form of magic these people have.