A "lit pixel" refers to a pixel in a display that is illuminated or turned on. There are various synonyms that can be used to describe this phenomenon. For example, "active pixel," "bright pixel," "glowing pixel," or "functional pixel" can all be used interchangeably to indicate a pixel that is working properly. On the other hand, a pixel that is not working as intended can be described using terms such as "dead pixel," "broken pixel," "inactive pixel," or "dark pixel." Although these terms may vary, they all ultimately describe the functionality of individual pixels within a display or screen.