M - This symbol signifies that the anchor, chains or wire rope, which have been specified by the

Owner for position mooring, have been tested in accordance with the specifications of the Owner and

in the presence of a Surveyor. It is applicable to ship type displacement hull designed for offshore

operation as well as to multiple hull design. The symbol M is placed after the classification notation.

Since 1920, it is the hull classification for a Destroyer.

BWh

colon used number and other symbol

colon used number and other symbol