CRT is a proper noun. CRT is (1) a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen.
The following articles provide more information about the proper noun CRT.
Monitors are an integral part of a computer system. They display digitally generated data from a computer onto a CRT (cathode ray tube) or an LCD (liquid crystal display).
A video projector uses a video signal to project an image onto a screen. Video projectors use CRT, LCD, or DLP technology. Visit this site to learn more about video projectors.
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The following digital image illustrates the proper noun CRT.