S4
S4, S 4, Š-4, S.4 or S-4 may refer to:
In arts, hobbies, and entertainment
- Yamaha grand piano model S4
- S4 standard, a standard of P4 gauge with reduced tolerance, a highly accurate 4 mm/1 ft railways modeling format
- Sonic the Hedgehog 4: Episode I, video game
- Super 4 (TV series), animated TV series that began in 2014
In science and technology
In biology and medicine
- Fourth heart sound, or S4, an abnormal heart sound often indicative of congestive heart failure or cor pulmonale
- Sacral spinal nerve 4, a spinal nerve of the sacral segment
- Fourth sacrum of the vertebral column, in human anatomy
In computing
- Samsung Galaxy S4, a smartphone
- Samsung Galaxy S4 Mini, a mini version of the Samsung Galaxy S4
- hibernation a sleeping state in which the contents of RAM are saved to a hard disk (Advanced Configuration and Power Interface code)
- S (programming language) version 4
- SG2 Shareable (Fire Control) Software Suite (S4)
In mathematics
- S4, a normal modal logic
- S4 algebra, a variety of modal algebras, also called Interior algebra
- Symmetric group S4 (S4), an abstract mathematical group
In other sciences
- Tetrasulfur (S4), an allotrope of sulfur
- British NVC community S4; see Swamps and tall-herb fens in the British National Vegetation Classification system
- S4: Keep away from living quarters, a safety phrase in chemistry
Other technologies
- For uses in transportation, see section § In Transportation, below.
- Nikon Coolpix S4, a camera
- Sanyo DSC-4 and Sanyo Xacti DSC-4, cameras that have the Exif designation S4
- Source Four, an ERS theatre lighting fixture by Electronic Theatre Controls
In transportation
Air transport
- Letov Š-4, a 1923 Czechoslovak aircraft
- Hydra Technologies Ehécatl, S4, a Mexican unmanned aerial vehicle
- Seibel S-4, a 1951 helicopter
- SATA International (IATA airline designator)
Rail transport
- Alco S-4, a locomotive
- Prussian S 4, an 1894 steam locomotives class
Rail lines
- S4 (Berlin), a S-Bahn line
- S4 (Munich), a S-Bahn line in Munich
- Bremen S-Bahn line S4
- Hanover S-Bahn line S4
- RheinNeckar S-Bahn line S4
- Rhein-Ruhr S-Bahn line S4
- Rhine-Main S-Bahn line S4
- Rostock S-Bahn line S4, a 2010-planned future line
- Stuttgart S-Bahn line S4
- S4 (ZVV) line S4, a line of the S-Bahn Zürich in Switzerland
- Stadtbahn Karlsruhe line S4
Road transport
- Audi S4, a car
- Lancia Delta S4, a 1984 Group B rally car
- County Route S4 (California), a road in San Diego, California
Bus Services
- Stagecoach Gold bus route S4, a bus route in Oxfordshire, England
Other forms of transport
- Supermarine S.4, a 1925 British seaplane
- USS S-4 (SS-109), a 1919 US Navy submarine
Other uses
- S4 (military), a logistics officer within military units
- S-4 (Sector Four) an alleged facility in the Papoose Lake portion of Area 51 investigating alien spacecraft
- Form S-4, a form required by the Securities and Exchange Commission to declare mergers and acquisitions
- S04, or FC Schalke 04, a German professional sports club
- S postcode area, covering areas of northern Sheffield, England
- S4 (Dota player), Gustav Magnusson, Swedish Dota 2 player
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