Hull Classification Symbol
The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration use hull classification symbols (sometimes called hull codes or hull numbers) to identify their ship types and each individual ship within each type. The system is somewhat analogous to a system of pennant numbers the Royal Navy and some European and Commonwealth navies (19 in total) use.
Read more about Hull Classification Symbol: History, National Oceanic and Atmospheric Administration, United States Navy Hull Classification Codes, National Oceanic and Atmospheric Administration Hull Codes
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“Mysticism is the mistake of an accidental and individual symbol for an universal one.”
—Ralph Waldo Emerson (1803–1882)