A raygun is a type of fictional device that fires a beam of (usually) destructive energy used in science fiction; a form of directed-energy weapon. They have various alternate names: ray gun, death ray, beam gun, blaster, laser gun, phaser, zap gun etc. They are a well-known feature of science fiction; for such stories they typically have the general function of guns. In most stories, when activated, a raygun emits a ray, typically visible, usually lethal if it hits a human target, often destructive if it hits mechanical objects, with properties and other effects unspecified or varying.