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...
The ss stands for steamship.
S.S. in front of the name of a ship stands for steamship.
SS means Streamship.
people say it Steamship but I'm not sure