Hand Pocket (ハンドポケット, Hando Poketto), also known as Iai (居合, Iai), is a fighting technique.
At the beginning, the user must to hide his hands in his pockets. Then he makes a suprise attack with a fast and precise movement.
Shobun Ron used the technique for the first time in the series. Also, Biscuit Oliva made his own version of this fighting move and used it against him. Later, it was revealed that Doppo Orochi also can perform the move. In the third series of the manga, Baki Hanma and Yujiro Hanma used that technigue in their final fight.