Roundhouse to Triple Spin Kick is a move introduced to Kazuya Mishima in Tekken 2. Jin Kazama can perform this move in Tekken 3 and Tekken Tag Tournament and Devil Jin in Tekken 5 and Tekken 5: Dark Resurrection.
This move is good to make a lot of damage and combos. However, it is also predictable, especially in high level play, and from Tekken Tag Tournament to Dark Resurrection, if the second or third hit is blocked, the move will be interrupted and the character will be left open for attacks.
In Tekken 6, the move became unique to Kazuya Mishima and once again, the move will not be interrupted if the second or third kick is blocked.