SSN2

SSN2 is a designation that may refer to several concepts, depending on the context. In naval terminology, SSN denotes a nuclear-powered attack submarine, with the numerals indicating the hull number. In official United States Navy records, the first and most widely recognized nuclear submarine is SSN-571, Nautilus; there is no standard, widely accepted entry for an officially commissioned vessel designated SSN-2. When the designation SSN-2 appears in documents, it is frequently the result of a copy error, an older or non-nuclear predecessor hull number, or a fictional or speculative listing rather than a canonical submarine.

In popular culture and speculative writing, SSN-2 has been used as a fictional submarine designation. Such usage is not tied to an actual vessel in standard naval inventories.

Outside naval usage, SSN2 can be an acronym or product/version label in other domains, such as a reference to a second version of a Social Security Number in data discussions. This usage is not part of formal nomenclature and varies by context.

Because the meaning of SSN2 is ambiguous, disambiguation is typically required to determine whether it refers to a real-world naval hull number, a fictional construct, or another, unrelated acronym.

See also: SSN, Hull classification symbol, List of United States Navy submarines.