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An SSN is a nuclear-powered general-purpose attack submarine - SSN is the US Navy hull classification symbol for such vessels. SS means "Submarine, General" according to the NATO Standard Ship Designator System (STANAG 1166,) with SSN referring to a "Submarine Attack Nuclear" vessel. The "SS" designator is consistent with other examples of STANAG 1166 using double letter referring to a type of vessel - for example, "BB" designates a Battleships, "DD" is a Destroyer, "CC" a Cruiser, "FF" a Frigate, and so on.

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