Jodan Hiraken Tsuki is a technique in Kyokushin karate. It translates to 'Upper-Level Ridge Hand Thrust.' This technique involves delivering a thrusting strike with the ridge hand targeting the opponent's head or neck area. The term 'Jodan' refers to the upper level, 'Hiraken' indicates the ridge hand, and 'Tsuki' refers to the thrusting motion. It is commonly used to penetrate the opponent's defenses and deliver a powerful blow to vulnerable areas.