CRT or cathode ray tube is a device that was commonly used in televisions and computer monitors until the early 2000s. While the term is now less frequently used, there are several synonyms that can be used to describe the same device. Some of the common synonyms for CRT include electron gun tube, cathode ray oscilloscope, and beam tube. These synonyms are often used in technical and engineering contexts to describe the same technology. While CRTs may have fallen out of favor in recent years due to technological advancements, they still hold an important place in the history of electronic technology.