A spherical buoy may be lettered rather than being numbered.
What is a spherical buoy?
A spherical buoy can be defined as a type of buoy of which the larger part of the superstructure or the upper part of the body that has a spherical shape and it's distinctively lettered.
In this context, we can infer and logically deduce that a spherical buoy may be lettered and it is usually anchored in a swimming pool to mark the course for swimmers and triathletes.
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