The term "S.S." in the name of a ship stands for "Steam Ship", if it is a surface vessel - in the Navy, "SS" stands for Submersible Ship, or submarine. All vessels have some type of prefix designator to denote the type of ship it is. For example, M/V or MV stands for Motor Vessel, SV stands for Sailing Vessel, etc.
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The prefix "SS" designation on a merchant vessel stands for Steam Ship; there are several other designations that reveal the type of propulsion the vessel uses.
For example:
MV - Motor Vessel (vessels that run strictly on engines that do not convert water to steam for propulsion and electricity)
SV - Sailing Vessel
MT - Motor Tanker or Motor Tugboat
MSV - Motor Stand-by Vessel
There are several other prefix designations - you can view them at the link below.
SS is short for Steam Ship, and is generally used on civilian ships. If you are thinking of USS, this stands for United States Ship.
The prefix of a vessel's name indicates the kind of propulsion she has. SS for "Steamship," M/V for "Motor Vessel" (vessels that burn fuel in their engines.)
SS - SchutzstaffelSchutzstaffel - Protection Squad (literal translation) The SS ran the concentration camps. Please see the related question for more information on the SS.
my great granfather JosephWilson served on the SS Coniston and was accidentally drowned in the Thames on 6th June 1922. His headstone was erected by officers and crew of the SS Coniston at Bonemargey cemetry in Ballycastle Co Antrim.
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HMSmeans her majesty's ship.