Gambling 'MACHINE' is a term used to describe a device that is used to gamble, usually in the form of a SLOT MACHINE. SLOT machines are coin-operated machines with three or more reels that spin when a lever is pulled or a button is pressed. They are also known as one-armed bandits due to their ability to take money from players. SLOT machines are popular in casinos and other gambling establishments, and can be found in many countries around the world.