The Dragon pendant is a variation on the Gordian knot, it depicts an ouroboros dragon biting his own tail. The ouroboros dragon is an ancient alchemy symbol that symbolizes the equality of the internal and external to the alchemist’s soul.
The Gordian knot can be made on a Torus tube which looks like a donut or a sphere that turns in from one side to comes out the other in a perpetual motion. The Torus Tube contains many mathematical formulas and equations. Science has begun using this model as a geometric/mathematical model of the universe. Sacred geometry also makes extensive use of this shape.
The dragon pendant is a symbol of unity; implied by both the aspect of the Gordian knot symbol, as well as the aspect of the ouroboros dragon biting his own tail.