What Is a Semophoric Whistling?

semophoric whistling, or whistling as a form of signalling. This is something that goes back archaic humans. Citing peter f otswald, they share, quote, whistles are easier to hear than words because they concentrate sound energy into a narrow segment of the frequency spectrum instead of spreading it generally. They occur in the frequency range of one thousand to four thousand cycles per second, to which the human ear is most sensitive.