Kyokushin Symbols
  The two symbols of Kyokushin Karate are the Kanji, which means Kyokushinkai , and the round symbols named Kanku. The Kanji is worn on the left side of the uniform ( dogi ) of all Kyokushin practitioners. The Kanku badge is usually worn on the left arm of the dogi.
Additionally in our organization we have the IFK symbol which is worn on the right arm of the dogi.
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Kanji
Kanku
IFK
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The logo of International Federation of Karate - The central symbol a rising wave, which is taken from Saiha Kata and it symbolizes overcoming all obstacles .

The Kanku symbol is taken from the kata Kanku Dai - sky gazing form , where the hands are raised  above the head with the thumbs and index fingers touching as the practicioner focuses their gaze through the hands.
The Kanji is the symbol that is universally known to represent Kyokushinkai and incorporates the three kanjis from Kyokushinkai : Kyoku - Ultimate ; Shin - Truth ; Kai - Society