What is a buoy bearing the number 5 and flashing green lights?

A buoy bearing the number 5 with flashing green lights typically indicates a navigational marker in maritime contexts. It is often used to mark safe channels or indicate the location of a specific hazard, and the green light signifies that vessels should keep the buoy on their starboard (right) side when navigating in a particular direction. These buoys are part of the lateral system of navigation aids, helping mariners safely navigate waterways.