VU meter

Noun

 * 1) A display in audio equipment that represents the loudness of the signal.
 * 2)  Any animated graphical representation of the volume of sound or music (often subdivided across channels).
 * 1)  Any animated graphical representation of the volume of sound or music (often subdivided across channels).
 * 1)  Any animated graphical representation of the volume of sound or music (often subdivided across channels).