Technically, LASER is an acronym, standing for Light Amplification by Stimulated Emission of Radiation, although in truth, nothing is really being amplified. Instead, the electrons oscillate between either the excited-and-ground state or two different excited states, but for some unknown reason, no one wanted the acronym Light Oscillation by Stimulated Emission of Radiation. (I wonder why!)
@akerro: Kto używa ten przegrywa ;)