Instructor
Shihan
Master instructor
Renshi
Instructor who has mastered oneself, an expert instructor
Sempai
Senior (student who helps teaching, not a black belt)
Shidoin
Assistant instructor, not yet recognized as a Sensei
Sai ko Shihan
Grand master
Meijin
Highest title in martial arts. Was given to Sensei Otsuka by the Royal Family of Japan.
Kohai
Junior Student. Colored belt.
Dan
Degree (black belt rank)
Dai Sampai
Student elevation
Shodan-ho
Brown / Red belt being recommended for black belt (shodan)