The term 45 PLAYER is a reference to a type of record player. A phonograph, or 'phono' for short, is a device that plays sound recordings, usually vinyl records. HIFI stands for 'high fidelity, ' which is a term used to describe audio equipment that reproduces sound with minimal distortion. A 45 player is a type of record player that plays 7-inch vinyl records at 45 revolutions per minute (rpm).