Time Signal

A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day.

Read more about Time Signal:  Audible and Visible Time Signals, Electrical Time Signals

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    A signal is comprehended if it serves to make us notice the object or situation it bespeaks. A symbol is understood when we conceive the idea it presents.
    Susanne K. Langer (1895–1995)