Submarine, for which "SS" is the United States Navy designator

Sickle-cell disease

Steamship a ship powered by steam

Social security, a field of social welfare concerned with the fulfillment of socially recognized needs

Saints, often abbreviated "SS" in the plural (e.g. "SS Peter and Paul")

SS usually refers to the Schutzstaffel, a Nazi paramilitary force. It may also refer to:

Social Studies, a group of academic disciplines that study the human aspects of the world

A sports car sold by the Australian Holden Commodore car company

Selective Service, the means by which the United States administers military conscription

Special Service, a division of soldiers in British service during World War II (later renamed Commandos)

The ß ligature (German letter for double "s").

Società Sportiva (Italian for "Sport Society"), frequently found as an identifier in the names of Italian sports clubs

Spread Spectrum, a communications technique (FHSS, DSSS, CDMA), usually used for wireless

Collar of Esses, an ornamental collar in British heraldry

Stone Sour, an American Rock band

Sassari, an Italian province

single-speed bicycle, a bicycle, often a mountain bike, having only one gear ratio

Super Sport, a commercial designation for certain American sports cars in the late 20th century.

Shortstop, a defensive position in baseball

Society of Saint-Sulpice, in that the initials "S.S." after a person's name may indicate membership therein

Strong Safety, a defensive position in American and Canadian football

Swallow Sidecar Company, the former name of the Jaguar automobile company

Shaoshan, a series of electric locomotives in China railway

Stockholms Spårvägar, the former public streetcar and bus operating company (1915-66) in Stockholm, Sweden

SS Cars Ltd, the forerunner of Jaguar

Sabbath School, part of the weekly Seventh-day Adventist Church service

Surface-to-surface missile of Soviet/Russian type, as listed by NATO

Sum of squares, a mathematical equation used in statistics

Slave select, a control line for the Serial Peripheral Interface Bus

Corsairfly, a Paris-based airline company with IATA airline code "SS"

Sand Springs Railway, which has the Association of American Railroads (AAR) reporting mark "SS"

Swati language, ISO code

SS (manga), a Japanese comic produced between 2000 and 2003