A futuristic weapon is a type of weapon that is advanced and often used in science fiction. The three most common futuristic weapons are phaser, LASER, and raygun. Phaser is a fictional directed-energy weapon that is used in the Star Trek universe. LASER is an acronym for Light Amplification by Stimulated Emission of Radiation and is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Raygun is a type of fictional directed-energy weapon that is typically portrayed as a handheld device that emits a beam of destructive energy.