The bagua is an ancient Chinese philosophical concept and design. The bagua is an octagon that contains eight trigrams that represent various aspects of nature, relationships and direction. The Yi-Yang symbolizes the unity of opposites and thus represents coexistence. You can find much information about the concpet of the bagua and Yin-Yang online.
My BAGUA & YIN-YANG badges are cast in white metal that resembles antique silver. The detail is laid in with black resin enamel. Custom colors are aavailable. These badges fit #200, #205 and #207 Zippos.