fog signal

noun
any of various types of signal used as a warning by vessels navigating in fog or mist.

Origin:
1750–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fog signal
 
n
a signal used to warn railway engine drivers in fog, consisting of a detonator placed on the line

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

fog signal

sound or light signal emitted in fog or mist by lighthouses and buoys to indicate a shoreline, channel, or dangerous stretch of water and by vessels to indicate their position. Each signal has a distinctive code. All vessels, whether stationary or moving, are required by law to utilize fog signals in inclement weather; the type, number, length, and timing of the signal indicate the size of the vessel and its position. The nature and application of fog warnings is codified in the International Regulations for Preventing Collisions at Sea (commonly called International Rules of the Road), applicable to all international waters. The earliest sound signals were made by bells, gongs, and explosives; these largely have been replaced by foghorns powered by compressed air or electricity. See also lighthouse.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Every fog signal station sounded its own distinctive pattern so that captains could pin-point their position.
The same construction crew that built the tower and the fog signal built it.
Attached to the light tower is a fog signal building consisting of a brick structure with a gabled roof.
There are other historic structures on site, including an oil house and a fog signal area.
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