Vessel Designation is a term used in the maritime industry to refer to the unique name or number assigned to a ship. This designation is used to identify the vessel and its ownership, as well as to track its movements. The term HER, which is a three-letter acronym, is often used as part of the vessel designation. It stands for 'Hull Identification Number, ' which is a unique identifier assigned to each vessel. This number is used to track the vessel's movements and to ensure that it is properly registered.