The pepper-box revolver or simply pepperbox (also "pepper-pot", from its resemblance to the household pepper grinder) is a multiple-barrel repeating firearm that has three or more barrels grouped around a central axis. It mostly appears in the form of a multi-shot handheld firearm. Pepperboxes exist in all ammunition systems: matchlock, wheellock, flintlock, percussion, pinfire, rimfire and centerfire.
The pepperbox should not be confused with a volley gun (like the seven-barrel long gun made by Nock), a firearm that fires multiple projectiles simultaneously by use of multiple barrels. The difference is that a volleygun fires all the barrels simultaneously while the pepperbox is a repeater. Neither should it be confused with a firearm having multiple barrels next to each other (like the Jarre), which is known as an "Harmonica gun".