What do the letters before a ships name like “SS,” ” RMS,” “HMS,” etc. stand for?
The letters are abbreviations designating the type of ship they were. SS = steamship, RMS = Royal Mail Steamer, and HMS is designated to British warships; His or Her Majesty’s Ship. There is another one that was used for the 2nd Britannic. HMHS, which stands for His or Her Majesty’s Hospital Ship.