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Related to can buoy: nun buoy
(Nautical Terms) nautical a buoy with a flat-topped cylindrical shape above water, marking the left side of a channel leading into a harbour: red in British waters but green (occasionally black) in US waters. Compare nun buoy
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a cylindrical, unlighted buoy used as a channel marker.
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