Haishu Uke in Shotokan Karate refers to a blocking technique using the back of the hand (haishu). Unlike Teisho Uke, which uses the palm heel, Haishu Uke involves turning the hand so the back faces outward to intercept or redirect an opponent's attack. This block is typically employed against strikes aimed at the head or upper body, providing a quick and versatile defense. Haishu Uke emphasizes timing and agility, allowing practitioners to efficiently defend while setting up for counterattacks or transitioning into other defensive maneuvers.