What Does SS Mean on a Ship?

What does SS mean on a ship? screw steamer Usage. Historically, prefixes for civilian vessels often identified the vessel’s mode of propulsion, such as, “”SS”” (screw steamer), “”MV”” (motor vessel), or “”PS”” (paddle steamer). Alternatively, they might have reflected a vessel’s purpose, e.g. “”RMS”” (royal mail ship), or “”RV”” (research vessel). Read more on en.wikipedia.org … Read more