S4, S 4, Š-4, S.4 or S-4 may refer to:

People

S4 (Dota player) Gustav Magnusson (born April 1, 1992), better known as s4, is a Swedish professional ''Dota 2'' player. As a member of Alliance, s4 won The International 2013. Professional career 2012: Early Career s4's ''Dota 2'' career started in early 2 ...

, Gustav Magnusson, Swedish ''Dota 2'' player *

S4 (military) A military staff or general staff (also referred to as army staff, navy staff, or air staff within the individual services) is a group of officers, Enlisted rank, enlisted and civilian staff who serve the commanding officer, commander of a D ...

, a logistics officer within military units

Places

County Route S4 (California) There are 34 routes assigned to the "S" zone of the California Route Marker Program, which designates county routes in California. The "S" zone includes county highways in Imperial, Orange, Riverside, San Diego, and Santa Barbara counties. S ...

, a road in San Diego, California

Science and mathematics

Mathematics

S4 algebra In abstract algebra, an interior algebra is a certain type of algebraic structure that encodes the idea of the topological interior of a set. Interior algebras are to topology and the modal logic S4 what Boolean algebras are to set theory and ordi ...

, a variety of modal algebras, also called Interior algebra *

Symmetric group S4 Symmetry (from grc, συμμετρία "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definiti ...

(S₄), an abstract mathematical group * S4, a

normal modal logic In logic, a normal modal logic is a set ''L'' of modal formulas such that ''L'' contains: * All propositional tautologies; * All instances of the Kripke schema: \Box(A\to B)\to(\Box A\to\Box B) and it is closed under: * Detachment rule (''modus po ...

Chemistry

* S4: Keep away from living quarters, a safety phrase in chemistry *

Tetrasulfur The element sulfur exists as many allotropes. In number of allotropes, sulfur is second only to Allotropes of carbon, carbon.#Greenwood, Greenwood, 652 In addition to the allotropes, each allotrope often exists in Polymorphism (materials science) ...

(S₄), an allotrope of sulfur

Biology

Fourth heart sound The fourth heart sound or S4 is an extra heart sound that occurs during late diastole, immediately before the normal two "lub-dub" heart sounds (S1 and S2). It occurs just after atrial contraction and immediately before the systolic S1 and is cau ...

, or S₄, an abnormal heart sound often indicative of congestive heart failure or cor pulmonale * Fourth

sacrum The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30. The sacrum situates at the upper, back part ...

of the vertebral column in human anatomy *

Sacral spinal nerve 4 The sacral spinal nerve 4 (S4) is a spinal nerve of the sacral segment.American Medical Association
...

, a spinal nerve of the sacral segment

Technology

S (programming language) S is a statistical programming language developed primarily by John Chambers and (in earlier versions) Rick Becker and Allan Wilks of Bell Laboratories. The aim of the language, as expressed by John Chambers, is "to turn ideas into software, quic ...

version 4 *

Hibernation Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It most ...

a sleeping state in a computer *

SG2 Shareable (Fire Control) Software Suite (S4) The NATO Army Armaments Group (NAAG) Integrated Capability Group Indirect Fires (ICGIF), formerly Land Group 4, and their Sub Group 2 (SG2) on Surface to Surface Ballistics has created a widely used set of shareable fire control software using th ...

Nikon Coolpix S4 The Coolpix S4 is a brand of digital camera produced by Nikon. Its image sensor is a CCD with 6.0 million pixels. It has a thin-film transistor liquid crystal display device with 110,000 pixels. The S4 incorporates Nikon's popular swivel desig ...

, a camera *

Samsung Galaxy S4 The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics as the fourth smartphone of the Samsung Galaxy S series and was first shown publicly on March 14, 2013, at Samsung Mobile Unpacked in New York City. It is the succes ...

, a smartphone *

Samsung Galaxy S4 Mini The Samsung Galaxy S4 Mini (stylized as Samsung GALAXY S4 mini) is an Android smartphone developed by the Korean manufacturer Samsung Electronics. Announced on May 31, 2013 and released in July 2013, the S4 Mini is a mid-range model of its flags ...

, a mini version of the Samsung Galaxy S4 *

Samsung Galaxy Tab S4 The Samsung Galaxy Tab S4 is a tablet computer developed and produced by Samsung Electronics. It is the successor of the previous Galaxy Tab S3, and was announced alongside the cheaper Samsung Galaxy Tab A 10.5. History The Tab S4 was reveal ...

, an Android tablet

Transportation

Routes

S4 (Berlin) The S4 line number was used by the Berlin S-Bahn between December 1997 and June 2002. The line acted as a temporary route for the re-opened parts of the Berlin S-Bahn ring (''Ringbahn'' in German) until the complete ring was fully re-opened in Ju ...

, an S-Bahn line *

S4 (Munich) Line S4 is a line on the Munich S-Bahn network. It is operated by DB Regio Bayern. It runs from Geltendorf station to Ebersberg station via Pasing, central Munich, Munich East and Grafing station. The line is operated at 20-minute intervals ...

, an S-Bahn line *

S4 (Nuremberg) The S4 is an S-Bahn service in the German city of Nuremberg. It is one of the five services of the Nuremberg S-Bahn network. It was opened in 2010 and has 16 stations. The route is long and runs from Nürnberg Hauptbahnhof to Dombühl. Until 9 D ...

, an S-Bahn line *

S4 (Rhine-Main S-Bahn) The S4 service of the S-Bahn Rhein-Main The Rhine-Main S-Bahn system is an integrated rapid transit and commuter train system for the Frankfurt/Rhine-Main region, which includes the cities Frankfurt am Main, Wiesbaden, Mainz, Offenbach am Main ...

, an S-Bahn line *

S4 (Rhine-Ruhr S-Bahn) Line S 4 is an S-Bahn of the Rhine-Ruhr S-Bahn, running from to the Dortmund suburb of Dortmund-Lütgendortmund. It is operated by DB Regio on behalf of Verkehrsverbund Rhein-Ruhr. It is operated at 30-minute intervals (15-minute intervals in the ...

, an S-Bahn line *

S4 (St. Gallen S-Bahn) The S4 is a railway service of the St. Gallen S-Bahn that provides hourly service over a circular route (german: Ringzug) that includes , , and , in the canton of St. Gallen. Südostbahn, a private company primarily owned by the federal governmen ...

, an S-Bahn line in Switzerland *

S4 (RER Vaud) The S4 is a railway service of RER Vaud that provides hourly service between and in the Swiss canton of Vaud. A limited number of trains continue from Aigle to . On weekdays, a section of the train operates from to . Swiss Federal Railways ...

, an S-Bahn line in Switzerland *

S4 (ZVV) The Sihltal railway line (german: Sihltalbahn) is a railway line in the Swiss canton of Zürich, which connects the city of Zürich with the communities of the Sihl Valley. Passenger service on the line now forms part of the Zürich S-Bahn, brand ...

line S4, a line of the S-Bahn Zürich in Switzerland *

Bremen S-Bahn The Bremen S-Bahn (german: Regio-S-Bahn Bremen/Niedersachsen) is an S-Bahn network in Germany, covering the Bremen/Oldenburg Metropolitan Region, from Bremerhaven in the north to Twistringen in the south and Bad Zwischenahn and Oldenburg in t ...

line S4 * Hanover S-Bahn line S4 *

Rhine-Neckar S-Bahn The Rhine-Neckar S-Bahn ''(S-Bahn RheinNeckar)'' forms the backbone of the urban rail transport network of the Rhine Neckar Area, including the cities of Mannheim, Heidelberg and Ludwigshafen. The S-Bahn operates over 437 km of route in the ...

line S4 *

Rostock S-Bahn The Rostock S-Bahn (german: S-Bahn Rostock) is a S-Bahn (suburban railway) network in Rostock in the German state of Mecklenburg-Vorpommern. It consists of three lines with a total length of about 90 km. Line S1 runs from Rostock Hauptbahnhof ...

line S4, a 2010-planned future line *

Stadtbahn Karlsruhe The Karlsruhe Stadtbahn is a German tram-train system combining tram lines in the city of Karlsruhe with railway lines in the surrounding countryside, serving the entire region of the middle upper Rhine valley and creating connections to neighbou ...

line S4 *

Stuttgart S-Bahn The Stuttgart S-Bahn is a suburban railway system (S-Bahn) serving the Stuttgart Region, an urban agglomeration of around 2.7 million people, consisting of the city of Stuttgart and the adjacent districts of Esslingen, Böblingen, Ludwi ...

line S4 * S4, a line of the

Brussels Regional Express Network The Brussels S-train, also known as the Brussels Regional Express Network (french: Réseau Express Régional Bruxellois or RER); ( nl, Gewestelijk ExpresNet or GEN) is a suburban rail system in the Brussels Capital Region. It will offer fast conne ...

Vehicles

Alco S-4 The American Locomotive Company (often shortened to ALCO, ALCo or Alco) was an American manufacturer of locomotives, diesel generators, steel, and tanks that operated from 1901 to 1969. The company was formed by the merger of seven smaller locom ...

, a locomotive * Audi S4, a car *

Lancia Delta S4 The Lancia Delta S4 is a Group B rally car manufactured by the Italian car company Lancia. The Delta S4 competed in the World Rally Championship in 1985 and 1986, until Group B class was disbanded and the cars were eventually banned from competi ...

, a 1984 Group B rally car * Hydra Technologies Ehécatl, S4, a Mexican unmanned aerial vehicle *

Letov Š-4 The Letov Š-4 was a Czechoslovak single-bay, unstaggered biplane fighter and trainer in the 1920s. Production history The Š-4 was first created in 1922 as an intended successor to the SPAD S.VII and S.XIII, in service with the newly created ...

, a 1923 Czechoslovak aircraft *

Prussian S 4 The Prussian S 4's were German superheated express steam locomotives with the Prussian state railways, later grouped as DRG Class 13.5 in the Deutsche Reichsbahn. They were an evolutionary development of the Prussian S 3. The first locomotive wa ...

, an 1894 steam locomotives class *

Seibel S-4 The Seibel S-4 was a two-bladed, single-engine helicopter built by Seibel Helicopter. Designed by Charles Seibel, the S-4 was evaluated by the United States Army under the designation ''YH-24 Sky Hawk'', but would be rejected for service. The ...

, a 1951 helicopter * Supermarine S.4, a 1925 British seaplane *

USS S-4 (SS-109) USS ''S-4'' (SS-109) was an S-class submarine of the United States Navy. In 1927, she was sunk by being accidentally rammed by a United States Coast Guard destroyer with the loss of all hands but was raised and restored to service until stric ...

, a 1919 US Navy submarine

Groups, companies, organizations

* S04, FC Schalke 04, a German professional sports club *

Shift4 Payments Shift4 is an American payment processing company publicly listed on the New York Stock Exchange and based in Allentown, Pennsylvania. The company, founded in 1999 by the then 16-year-old Jared Isaacman, processes payments for over 200,000 busin ...

, a U.S. payment processor * SATA International (IATA airline designator "S4"), Azores Airlines

Other

S4 (classification) S4, SB3, SM4 are disability swimming classifications used for categorising swimmers based on their level of disability. Swimmers in this class have coordination problems affecting all four of their limbs, or have movement in their arms but no tr ...

, a disability swimming classification * Form S-4, a form required by the Securities and Exchange Commission to declare mergers and acquisitions * S4 standard, a set of standards for model railways ( P4 gauge)

People

Places

Science and mathematics

Mathematics

Chemistry

Biology

Technology

Transportation

Routes

Vehicles

Groups, companies, organizations

Other

See also