SSN (hull classification symbol)
Symbol for nuclear-powered general-purpose attack submarine / From Wikipedia, the free encyclopedia
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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; the SS denotes a submarine[1] and the N denotes nuclear power. The designation SSN is used for interoperability throughout NATO under STANAG 1166,[2] though navies use other terms.