A revolver is a type of small, single-barrel handgun equipped with a rotating cylinder that usually contains six chambers, though designs range from as few as four to as many as twelve. For revolvers with swing-out cylinders, most are designed to swing the cylinder 90 degrees to the left for loading, accommodating the common habit of using the right hand. This is why in Chinese it is often called a ‘left-wheel pistol,’ but its original name is ‘revolver,’ which has nothing to do with left or right.