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 old television set contained a massive crt where the electron beam struck the screen to create an image."
Initialism of Chinese remainder theorem.
"The professor explained that CRT is an initialism for the Chinese remainder theorem, a fundamental concept in number theory used to solve systems of simultaneous congruences."
In plain English: A CRT is an old-fashioned television that uses curved glass and glowing tubes to display images on its screen.
"The old CRT television in my parents' basement still works perfectly despite its heavy glass screen."