Bass Clef
A pitch indicator is called a metronome tuner.
Tone
Pitch.
the name of a low pitched sound is called a baritone or woofs. hi-fi systems have speakers called woofers, these are for the low notes
It is called pitch.
If it is significantly low, this can be an indicator of anemia.
low pitch
Low frequency = low pitch = long waves
Using the vertical velocity indicator to control pitch attitude in an airplane is not recommended because the vertical velocity indicator shows the rate of climb or descent, not the pitch attitude. It can cause unintended pitch changes if relied upon for pitch control, potentially leading to unstable flight conditions or loss of control. It is best to use the attitude indicator or other instruments specifically designed for pitch control.
Low frequency = low pitch = long waves
I think you mean its frequency, which is commonly described as its pitch
the high beam indicator is only on when the high beams are on