What is Ykkf?
1.
Yudansha Kobujitsu Karate-doh Federation
An international organisation in the martial arts world. It contains a number of schools teaching a number of styles, including Karate, Ju-jitsu and Kung Fu.
The YKK translates to "black belt ancient martial arts empty handed way".
Saiko Ron Yamanaka is the founder of the YKKF.