浮標

buoy

to float / superficial / floating / unstable / movable / provisional / temporary / transient / impetuous / hollow / inflated / to exceed / superfluous / excessive / surplus

mark / sign / label / to mark with a symbol, label, lettering etc / to bear (a brand name, registration number etc) / prize / award / bid / target / quota / (old) the topmost branches of a tree / visible symptom / classifier for military units

bar buoy / buoy marking shallows or sandbar