N'Delrek was a martial art known to the Romulan people.
It was an ancient art which was believed to have been nearly as old as Kormerek but was more respectable compared to the bone breaking discipline. N'Delrek resembled Terran Jujitsu and wrestling with the objective being to grapple the opponent to the ground where they would be disabled and forced onto the ground. Once the enemy was vulnerable, a series of punches or nerve strikes were designed to disable or kill the opponent.
Some of the basic moves included the joint lock known as Golradi, a throw known as Huunar and a nerve strike called Kellad. In addition thee was a grab and striking move allowing them to knock their opponent out. (Last Unicorn RPG module: The Way of D'era: The Romulan Star Empire)