Larger vessels over 300 gross tonnes also receive a permanent international IMO ship identification number, and European vessels over 20 metres receive a permanent ENI number.
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The numbering system is mandated by the European Recreational Craft Directive and descended from the American Ship Hull number system.
Lucky Number Slevin | Shelley Craft | Reynolds number | Norwegian National Academy of Craft and Art Industry | Mach number | serial number | Random number generation | International Standard Book Number | Chris-Craft Industries | prime number | Personal identification number | number | Landing Craft Support | Two in a Million/You're My Number One | Social Security number | Robert Craft | Rikki Don't Lose That Number | Prime number | Premium-rate telephone number | Jackass Number Two | Radio-frequency identification | Opus number | Number Girl | List of WTA number 1 ranked players | landing craft | Lah number | Identification friend or foe | Erdős number | Emergency telephone number | Betti number |