The "Ss" prefix often stands for "Screenshot" or "Social Series" in digital archiving.
The (later designated USS Santa Olivia ID-3125 ) was a steamship built in 1918 by the William Cramp & Sons Building & Engine Company for the Grace Steamship Company. Originally intended for commercial trade, it was immediately acquired by the U.S. Navy for service as a troop transport following the end of the Great War. Ss Olivia -4- jpg