The term CRT PART refers to a Cathode Ray TUBE Part, which is an integral component of a Cathode Ray TUBE (CRT) display. A CRT is an electronic device that uses a vacuum TUBE to display images on a screen. The TUBE contains an electron gun that emits a stream of electrons, which are then focused and deflected by magnetic fields to create the image. The CRT PART is the part of the CRT that contains the electron gun and other components necessary for the functioning of the CRT.