[Karate Title] Renshi is a master title meaning “polished expert” (usually given at 6th dan).

"A person who has mastered oneself." This person is considered an expert instructor. This status is prerequisite before attaining the status as Kyoshi. Renshi means "has a name." Renshi is no longer one of the many, so to speak. Renshi is usually given at yodan to rokudan, depending on the system.