ロケットパンチ
When a fist separates from its body and flies through the air. Often used by [[mecha]], and in [[Mega Man_(series)|]].

h4. See also:
* [[mazinger z (mecha)|Mazinger Z]] (Titular mecha from the 1972 [[Mazinger Z]] [[super robot]] manga and anime where it actually started)
* [[single mechanical arm]]/[[mechanical arms]]
* [[punching]]
rocket punch