In a music video sometimes there's a line or a circle that monitors the beat of the music and moves along with it. What's it called?

The line or circle that monitors the beat of the music in a music video is often referred to as a "visualizer" or "audio visualizer." These graphics are designed to visually represent the audio's rhythm and frequency, often syncing with the beat to enhance the viewing experience. They can take various forms, including waveforms or animated shapes, and are commonly used in Music Videos and streaming platforms.