floating markers anchored in water to show ships where it's safe to navigate or where anchors are dropped.
From Middle French 'boue' (chain), related to 'buoyant.' Originally meant the chains or apparatus, but came to mean the floating devices themselves.
Buoys are like underwater signs—they mark invisible hazards, channels, and anchoring spots that sailors can't see below the surface. Modern smart buoys collect weather and ocean data in real-time, making them essential tools for climate science and ship safety.
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