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Red with even numbers
Red buoys have even numbers and red lights; green buoys have odd numbers and green lights.
They are cylindrical
Sequential numbers appear sometimes on channel buoys
Numbers are always even on red buoys in the United States. 2,4,6,8, 10 and so forth. Not sure of letters, unless they are preferred channel markers which have horizontal red and green alternating bands and are always lettered.
A boat should cruise between a green and red buoy. The red buoy will always be located on the right side of your boat. Red buoys will always mean , returning, red, and right. There will be a number on a red buoy that will give the chart location. The numbers will always be even.
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In the United States, red buoys have red lights, and are even numbered. If the are unlit they are in the shape of a semi-cone and are called "nun" buoys. The day markers are red triangles.
A red cone shaped buoy is also known as a nun buoys and is marked with even numbers. Red cone shaped buoys are used to mark the left side of a channel waterway. They indicate that the boat is exiting the harbor and entering open waters.
Some red buoys are known as "nun" buoys.(Ref: SB-4)some red buoys are known as nun buoys