Alaska_Vols_G7_SING.png
Searched on the capitalized part –
https://en.wikipedia.org/wiki/Whistle_register
"Many babies and small children regardless of sex can produce sounds in the frequency range of the whistle register without any conscious effort. Typically, the whistle register in children extends from the soprano "high C" (C6 or 1046.5 Hz) to two Gs above (G7 or 3136.0 Hz). Some children, however, can produce pitches that surpass the upper limit of the keyboard."
3136 Hz
3136 hurts?
3.136 GHz hurts (as for a microwave weapon)?