The term used to describe the clenched hand when the fingers are curled into the palm and the thumb is retracted. This is typically used in unarmed combat, such as fist-fighting.
"A bunch of fives" is a Britishslang expression for a fist.
This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.