A strike is a directed physical attack with either an inanimate object (such as a weapon) or with a part of the human body intended to cause blunt trauma or penetrating trauma upon an opponent. There are many different varieties of strikes. An attack with the hand closed into a fist is called a punch; an attack with the leg or foot is referred to as a kick; and an attack with the head is called a headbutt. There are also other variations employed in martial arts and combat sports. Buffet or beat refer to repeatedly and violently striking an opponent. Also commonly referred to as a combination, or combo, especially in boxing or fighting video games.