Editing S2

'''S2''' or '''S II''' may refer to:
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==Science and technology==
* [[S2 (star)]], Milky Way galaxy
* [[S/2007 S 2]], a natural satellite of Saturn
* [[S2 impact]] (ie, "Spherules 2"), major impact of early Earth
* [[S2 map projection]], a map projection created at Google
* [[S2 steel]] (shock resisting steel)
* [[S2: Keep out of the reach of children]], a safety phrase in chemistry
* [[Disulfur]] (S<sub>2</sub>), an allotrope of sulfur
* [[Sulfide]] ({{chem2|S(2-)}}) anion

===Mathematics===
* S<sup>2</sup>, the two-dimensional [[n-sphere]]
* S<sub>2</sub>, the [[permutation group]] on two elements

===Biology and medicine===
* [[British NVC community S2]], a [[swamps and tall-herb fens in the British National Vegetation Classification system|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
<!--* [[S-2 (cell line)]], a human small cell lung carcinoma cell line-->
* [[Secondary somatosensory cortex]], a brain area in the parietal cortex
* [[Sacral spinal nerve 2]], a spinal nerve of the sacral segment
* Schedule 2, an Australian legal category assigned to drugs; See [[Standard for the Uniform Scheduling of Medicines and Poisons#Schedule 2 Pharmacy Medicine|Standard for the Uniform Scheduling of Medicines and Poisons]]
* S2, the second [[sacral vertebrae]]
* [[S2 (heart sound)|S<sub>2</sub> (heart sound)]], a sound in cardiac auscultation
* [[ATC code S02]] ''Otologicals'', a subgroup of the Anatomical Therapeutic Chemical Classification System

===Computing===
* [[S2 (programming language)]]
* [[S2 Spreadsheet]], by IBM in 1984

==Transportation==
===Cars===
* [[AS S1 and AS S2|AS S2]], a 1927 car manufactured in Poland 
* [[Audi S2]], a turbo-charged sports car
* Lotus Elise S2, a [[Lotus Elise#Series 2|Lotus Elise]] production series of roadster automobile
* Porsche 944 S2, a 3l naturally aspirated [[Porsche 944#944 S2|Porsche 944]] sports car

===Roads and bus routes===
* [[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''
* S2, an abbreviation for a standard [[single carriageway]] road, with a single lane going in each direction
* [[Stagecoach Gold bus route S2]], a bus route in Oxfordshire, England

===Aviation and space===
* [[Bangladesh]] (aircraft registration code)
* [[JetLite]] (IATA airline code)
* [[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
* [[S-II]] or S-2, the second stage of the Saturn V rocket

===Rail===
====Locomotives====
* [[Alco S-2]], a locomotive
* [[Pennsylvania Railroad class S2]], a unique steam turbine locomotive
* [[NER Class S2]], a class of British steam locomotives

====Passenger services====
* [[S2 (Berlin)]], an S-Bahn service
* [[S2 (Dresden)]], an S-Bahn service
* [[S2 (Munich)]], an S-Bahn service
* [[S2 (Nuremberg)]], an S-Bahn service
* [[S2 (RER Vaud)]], an S-Bahn service in Switzerland
* [[S2 (Rhine-Main S-Bahn)]], an S-Bahn service
* [[S2 (Rhine-Ruhr S-Bahn)]], an S-Bahn service
* [[S2 (St. Gallen S-Bahn)]], an S-Bahn line in Switzerland
* S2, a planned [[Bremen S-Bahn]] service
* S2, a [[Hamburg S-Bahn]] service
* S2, a [[Hanover S-Bahn]] service
* S2, a [[RheinNeckar S-Bahn]] service
* S2, a [[Rostock S-Bahn]] service
* S2, a [[Stuttgart S-Bahn]] service
* S2, a [[Stadtbahn Karlsruhe]] service
* [[S2 (ZVV)]], a service of the S-Bahn Zürich in Switzerland
* [[Line S2 (BCR)]], a commuter rail service in Beijing
* [[Line S2 (Milan suburban railway service)]]
* [[Line S2 (Nanjing Metro)]], a suburban rapid transit line currently under construction in China
* [[Line S2 (Wenzhou Rail Transit)]], a suburban rapid transit line currently under construction in China
* [[FGC line S2]], a suburban train service in Barcelona Province

==Military==
* [[Soviet submarine S-2|Soviet submarine ''S-2'']], a Soviet World War II submarine
* [[Grumman S-2 Tracker]], a US Navy aircraft
* [[Finnish torpedo boat S2|Finnish torpedo boat ''S2'']], which sank in 1925
* [[USS S-2 (SS-106)|USS ''S-2'' (SS-106)]], a US Navy submarine
* [[Göta Signal Corps]] (designation S2), a 1944–1997 Swedish Army signal unit
* [[S2 (missile)]], the first deployed French land-based strategic missile
* S-2, a military intelligence officer on the [[staff (military)#Intelligence / security / information operations (2)|staff]] of a regiment or battalion
* [[HMS Rorqual (S02)|HMS ''Rorqual'' (S02)]], a 1956 British Royal Navy ''Porpoise''-class submarine
* [[ORP S-2]], Polish World War II motor gun boat

==Organisations==
* [[S2 Records]], a subsidiary of Sony Music
* [[S2 (TV channel)]], a former Scottish television channel
* [[S2 Games]], a video game developer
* [[S2 Yachts]], a defunct sailboat-building company

==Products==
* [[Nintendo Switch 2]], a hybrid video game console
* [[Samsung Galaxy S II]], an Android smartphone
* [[Samsung Gear S2]], a Tizen smartwatch
* [[Samsung Galaxy Tab S2]], an Android tablet
===Cameras===
* Nikon S2, a 35mm rangefinder camera produced between 1954 and 1958 as part of the [[Nikon S-mount]] range
* [[Nikon 1 S2]], a digital mirrorless interchangeable lens camera
* [[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

==Other uses==
* [[Seremban 2]], a suburb of Seremban, located in Negeri Sembilan, Malaysia
* S2, a version of the racing simulation ''[[Live for Speed]]''
* S2, a district of the [[S postcode area]], covering areas of eastern Sheffield
* [[Seattle Sounders FC 2]], nicknamed S2
* [[Second year]], in the Scottish education system
* [[S2 (classification)]], used for categorising swimmers based on their level of disability
* ''[[Splatoon 2]]'', a 2017 video game for the Nintendo Switch
* [[Pitts Special]], Two-Seat Aerobatics Biplane

==See also==
* [[2S (disambiguation)]]

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