Fist

A fist is an action where a hand has the fingers curled into the palm and the thumb retracted, displaying the knuckles. You can have an open fist or a closed fist. Fists are used when Punch (combat)punching. Fists are also well-known revolution symbols. Various phenomema, which include the term "fist" in their name such as the sexual act of fisting or the fist bump greeting, involve the use of a fist.