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The "tomoe" on the upper left side has three tails. There is a cultural significance to the three tails of the tomoe either Japanese and/or Okinawan.
The circle with the koma-musubi knot for karate-obi is just a doodle put on for balance. It the knot is correctly tied, the ends of the obi balanced and the belt properly wrapped around the torso it also has a significance and as you can see those three also meet the three tails symbolism, i.e. 3, three or III, etc.