S2

S2, S 2, S.2 or S-2 may refer to:

In the military

 * S-2 (military), a military intelligence officer
 * Soviet submarine S-2, a Soviet World War II submarine
 * Grumman S-2 Tracker, a US Navy aircraft
 * Finnish torpedo boat S2, which sank in 1925
 * USS S-2 (SS-106), a US Navy submarine
 * a designation for Göta signalregemente, a 1944-1997 Swedish Army signal regiment

Automobiles

 * Audi S2, a turbo-charged sports car
 * Lotus Elise S2, a production series of roadster automobile
 * Porsche 944 S2, a 3l naturally-aspirated sports car (mf. 1989-1991)

Aircraft

 * Focke-Wulf S 2, a 1928 German trainer aircraft
 * SABCA S-2, a 1926 Belgian aircraft
 * Short S.2, a Short Brothers aircraft
 * Strojnik S-2, motorglider

Locomotives

 * Alco S-2, a locomotive
 * PRR S2, a unique steam turbine locomotive
 * Prussian S 2, an 1884 steam locomotives class

Lines and roads

 * S2 (Berlin), a S-Bahn line
 * S2 (Dresden), a S-Bahn line
 * S2 (Munich), a S-Bahn line
 * a planned Bremen S-Bahn line
 * a Hamburg S-Bahn line
 * a Hanover S-Bahn line
 * a Nuremberg S-Bahn line
 * a RheinNeckar S-Bahn line
 * a Rhein-Ruhr S-Bahn line
 * a Rhine-Main S-Bahn line
 * a Rostock S-Bahn line
 * a Stuttgart S-Bahn line
 * a Stadtbahn Karlsruhe line
 * S2 (ZVV), a line of the S-Bahn Zürich in Switzerland
 * County Route S2 (California)
 * Expressway S2 (Poland), a southern bypass of Warsaw
 * S2 National Highway, one of the National Highways of Pakistan
 * S2 expressway (Shanghai), an expressway in Shanghai also known as the Hulu Expressway

In science

 * S2 (star), a star in the center of the Milky Way galaxy
 * S/2007 S 2, a natural satellite of Saturn
 * British NVC community S2, a swamps and tall-herb fens community in the British National Vegetation Classification system
 * , an allotrope of sulfur

Businesses

 * S2 Records, a subsidiary of Sony Music
 * S2, a former Scottish television channel
 * S2 Games, a video game developer
 * S2 Yachts, a now-defunct sailboat-building company
 * S2 Security Corporation, an IP-based security product manufacturer

Cameras

 * Canon PowerShot S2 IS, a 2005 5.0 megapixel digital camera
 * FinePix S2 Pro, a 2002 interchangeable lens digital single-lens reflex camera by Fuji
 * Nikon Coolpix S2, a 5.4 million pixel digital camera

Other

 * S2 programming language
 * S2: Keep out of the reach of children, a safety phrase in chemistry
 * a district of the S postcode area, covering areas of eastern Sheffield
 * a heart emoticon
 * an abbreviation for a standard single carriageway road, with a single lane going in each direction

Acronyms

 * Bangladesh aircraft registration code
 * JetLite IATA airline designator
 * sacral spinal nerve 2, a spinal nerve of the sacral segment
 * Schedule 2, an Australian legal category assigned to drugs
 * second sacral vertebrae
 * second year in the Scottish education system
 * a version of the racing simulation Live for Speed

With superscripts and subscripts
S2 may refer to:
 * S2, a sound in cardiac auscultation
 * disulfur, an allotrope of sulfur

S2 may refer to:
 * The two-dimensional sphere
 * S² Engine, the SuperSolenoid engine of Neon Genesis Evangelion

S02

 * The special orthogonal group of a two-dimensional vector space
 * ATC code S02 Otologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * HMS Rorqual (S02), a 1956 British Royal Navy Porpoise-class submarine

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