What is input signal?

Famous quotes containing the words input and/or signal:

    Family life is not a computer program that runs on its own; it needs continual input from everyone.
    Neil Kurshan (20th century)

    Certainly the effort to remain unchanged, young, when the body gives so impressive a signal of change as the menopause, is gallant; but it is a stupid, self-sacrificial gallantry, better befitting a boy of twenty than a woman of forty-five or fifty. Let the athletes die young and laurel-crowned. Let the soldiers earn the Purple Hearts. Let women die old, white-crowned, with human hearts.
    Ursula K. Le Guin (b. 1929)