SSN
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SSN is a three-letter abbreviation with multiple meanings:
- Social Security Number, used by Social Security (United States).
- SSN, the hull classification symbol used by the United States Navy for an attack submarine that is propelled by nuclear energy, such as the Los Angeles-class of attack submarines.
- A 1996 novel by Tom Clancy describing the operations of a US Navy attack submarine
- Socialist Solidarity Network, a Trotskyist group in the UK.
- Sub System Number used in SCCP, SS7 routing
- SIM Serial Number used to identify a mobile phone's SIM card.
See also: SS, SSBN, Submarine, Global_Title_Translation