This is a name for the contrast or picture control. It describes a function that is otherwise not clearly spelled out in names of controls used on monitors. It is not a term found on a monitor control. (As “black level” clearly defines the brightness control function, “white level” more clearly defines the contrast or picture control function.) White Noise - A random signal having the same energy level at all frequencies (in contrast to pink noise which has constant power per octave band of frequency).