from The Century Dictionary and Cyclopedia
- n. An electric signaling apparatus on United States war-ships fitted at the masthead on top of the truck. It consists of a double lantern, the upper half containing a red and the lower a white electric lamp. By suitable switches on deck, either the red or the white light can be shown and by successive displays (in a system similar in principle to the Morse telegraph code) letters and signals can be made.
Sorry, no etymologies found.