The M.S in a ships name usually designates it, as a "merchant ship " SS is sailing ship, HMAS is her majesty Australian ship, HMS, her majesty's ship. USS united states ship. etc However there are instances where the initials before a ship's Name identify it as belonging to a particular company
MS stands for Motor Ship, just as SS stands for Steam Ship, meaning the type of propulsion.
AK usually means Alaska in postal terms.
Confederate States Ship
When used before the name of a ship, S.S. is an abbreviation for steamship.
SS means Streamship.It is usually understood to mean "Steam Ship" Some ships used TSS for "Turbine Steam Ship"
USS - United States Ship
HMS usually means Her Majesty's Ship, but inside a ring, it may be someone's initials.
SSV before the name of the ship Normandy means 'space shuttle vehicle'.
Training Ship
The "S S" before a ship's name is an abbreviation for Steamship. It indicates that the ship is propelled by steam engines.
The Mayflower was the name of the ship that the Pilgrims sailed on. The Ship, before the Pilgrims' Voyage, was used predominantly as a cargo ship.