A torpedo...
Trident Ballistic Missile Submarine
Royal Navy submarine
No
The Russian missile launching submarine, Typhoon Class, is slightly bigger than the USA missile launching submarine, Trident Class.
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Torpedo
The most likely form of delivery would be an Intercontinental Ballistic Missile, launched from the ground, or from a submarine. The missile flies high into the atmosphere, before splitting into several separate warheads, which then descend to their targets.
Torpedo
It's a submarine-launched ballistic missile system comprised of the Trident missile, the special Trident warheads and the Ohio-class ballistic missile sub.
The codes are- for conventional () non nuclear powered) Submarines- SS ( for example the U.S.S. is SS-297. Atomic subs are SSN or SSBn - BN if fitted for Ballistic missiles such as the Polaris or Trident types ( there is no Submarine Called the Polaris- it is a guided missile!) so SS- submarine, SSN- Nuclear submarine- SSBN- Nuclear submarine- Missile type.
The modern definition of a torpedo is a self-propelled underwater missile. (see related question)
USS George Washinton.