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A ship identifier refers to one of several types of identifiers used for maritime vessels. An identifier may be a proper noun (La Niña); a proper noun combined with a standardized prefix based on the type of ship (e.g. ); a serial code; a unique, alphanumeric ID (e.g. A123B456C7); or an alphanumeric ID displayed in international signal flags (e.g. , representing U6CH).

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