The Kanji 漢字 (Japanese characters) calligraphy, worn universally on the front of the Gi, is a stylized form of the characters for "Kyokushinkai", which is the name given by Sosai Mas Oyama to the karate style he created. It is composed of three characters:
極 Kyoku meaning "Ultimate"
真 Shin meaning "Truth"
会 Kai meaning "Association"