Marker buoy
From BAWiki
Definition
Fixed founded pole or lattice mast-like navigation buoys with identification by shape or form and color, as a possibly striking contrast against the background. This includes the "Bleesbaken" (pollard willows) on groyne heads in the Rhine. At channels radar reflectors can be used as beacons (beacon in radar reflector design).
Synonyms
Abbreviations
Source
translated from DIN 4054 and the Rheinsolhlenerosion 1997