A beam generator is a device that produces a beam of energy, usually in the form of light or sound. The term can refer to a variety of different devices, including lasers, masers, minds, mills, and boilers. A LASER is a device that emits a narrow, intense beam of light, while a maser is a device that emits a beam of microwaves. A MIND is a device that produces a beam of mental energy, while a MILL is a device that produces a beam of mechanical energy. Finally, a BOILER is a device that produces a beam of steam.