photovoltaic panel 
Device that converts solar energy into electricity to power the light.
daymark
Navigation aid that is visible by day only; it displays various colors and signage.
sinker
Heavy object often made of concrete; it rests on the bottom of the waterway to keep the buoy in place.
bridle assembly
Two chains that link the flotation section to the mooring chain.
superstructure
Metal frame that forms the buoy’s body and contains all its elements.
topmark
Metal cone-shaped part atop a buoy that serves as a navigation aid during the day; its position signifies various meanings.
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