Double Palm Strike (無双掌破 Musō Shōha?, lit. "Unmatched Palm Blast") is a move used by Heihachi Mishima since Tekken 5. The first hit was renaimated in Tekken 8 and the string renamed to Muso Palm Strike.
Description[]
Heihachi hits his opponent with a quick left uppercut followed by a fast left palm to the face. The move is a natural combo on hit but does not jail on block, meaning the second hit can be ducked if the first hit was successfully guarded against. Pressing 2 instead of 1 for the second hit will change the string into either the Twin Pistons or Muso Tettsui, depending on the game.
It also appears in Street Fighter X Tekken as one of his unique attacks/command normals, alongside the aforementioned Muso Tettsui and the exclusive Muso Kageki.