S2
S2, S 2, S.2 or S-2 may refer to:
In the military
- Staff_(military)#Intelligence_.2F_security_.2F_information_operations_.282.29, a military intelligence officer (S-2) on the staff of a regiment or battalion
- 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
Transportation
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
- Grumman S-2 Tracker, a 1952 United States Navy anti-submarine warfare (ASW) 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
Lines and roads
- S2 (Berlin), an S-Bahn line
- S2 (Dresden), an S-Bahn line
- S2 (Munich), an S-Bahn line
- S2 (Rhine-Ruhr S-Bahn), an 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 Rhine-Main S-Bahn line
- a RheinNeckar 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
- Line S2, Beijing Suburban Railway
- Line S2 (Milan suburban railway service)
- 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
- FGC line S2, a suburban train line in Barcelona Province
In science
Astronomy
- S2 (star), a star in the center of the Milky Way galaxy
- S/2007 S 2, a natural satellite of Saturn
Biology
- Secondary somatosensory cortex, a brain area in the parietal cortex
- British NVC community S2, a swamps and tall-herb fens community in the British National Vegetation Classification system
- Schneider 2 cells, or S2 cells, a commonly used Drosophila cell line
Chemistry
- Disulfur (S2), 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
Cameras
- Nikon S2, a 35mm rangefinder camera produced between 1954 and 1958 as part of the Nikon S-mount range.
- 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
- Leica S2, a 2009 37 million pixel medium format digital single-lens reflex camera
- Nikon Coolpix S2, a 5.4 million pixel digital camera
Other
- Samsung Galaxy S II
- S2 programming language
- S2 Spreadsheet
- 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
- the nickname of Seattle Sounders FC 2
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
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