The Symbol itself is the equivalent of the Egyptian Ankh or the Rosicrucian's Rosy Cross; which represents the microcosmic forces (the pentacle, representation of the pentagram with 5 elements, the tetragrammaton or YHVH) interweave with the macro-cosmic forces (the hexagram, the representation of the planetary or heavenly cosmic forces, the divine).
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The unicursal hexagram was part of the symbol called "The Seal of Orichalcos" that was prominent in the Waking the Dragons arc of Yu-Gi-Oh!.