Ever Wondered The Red Light that Goes "ON" "OFF" on a Craft.. The Beacon....
Can Be Seen from Milllllllllesssssss Away ........... 

A beacon is an intentionally conspicuous device designed to attract attention to a specific location.

Beacons can also be combined with semaphoric or other indicators to provide important information, such as the status of an airport, by the colour and rotational pattern of its airport beacon, or of pending weather as indicated on a weather beacon mounted at the top of a tall building or similar site. When used in such fashion, beacons can be considered a form of optical telegraphy.

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