Mitsu tomoe
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Created from three joined tomoe, the mitsu tomoe is a popular symbol in Japan.
Originally, it was associated with the shinto war deity Hachiman, and through that was adopted by the samurai as their traditional symbol. The mitsu tomoe has been used in Japanese family crests (kamon) and corporate logos, and is a traditional symbol of Okinawa. Jeju-do's flag has a mitsu tomoe on it, as did the Ryūkyū Kingdom's flags.
Some view the mitsu tomoe as representative of the threefold division at the heart of the Shinto religion.