Why is this shape significant? Another word for the star tetrahedron is the Merkaba. It harmonizes male and female energy, much like a Yin/Yang symbol. The star of David is a two dimensional version of a Merkaba, and was reputed to have been painted on the shields of the armies of King David as a symbol of divine protection. The Merkaba steps down source energy into the physical and is an invocation of the phrase “as above, so below”.
– Magic-point.org, The Merkaba