fire button

Noun

 * 1)  A button on a joystick or joypad that corresponds to the action of firing a weapon, but often represents other in-game actions.
 * 2) * 1986, Rachael Smith, Bomb Jack (video game review in Your Sinclair issue 5, May 1986)
 * You launch him into the air with a quick press on the fire button, trying to pass over bombs as you fly.