yes
yes
yes
Red with even numbers
Red buoys have even numbers and red lights; green buoys have odd numbers and green lights.
Nun buoys typically have odd numbers. In the IALA buoyage system, odd-numbered nun buoys are used to indicate the right side of a navigable channel when approaching from seaward. They are usually colored red and have a conical shape. Even-numbered buoys, on the other hand, are used for the left side of the channel and are typically green.
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.
The question does not make sense.
In U.S. coastal waters, even-numbered nun buoys are colored green. These buoys are typically cone-shaped and are used as navigational aids to indicate the channel's edge and help boaters identify safe passage. They are part of the lateral buoy system, where even-numbered buoys are on the port side when entering from the sea.
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.