S4, S 4, Š-4, S.4 or S-4 may refer to:
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PeopleEdit
- S4 (gamer), Gustav Magnusson, Swedish Dota 2 player
- S4 (military), a logistics officer within military units
PlacesEdit
- County Route S4 (California), a road in San Diego, California
Science and mathematicsEdit
MathematicsEdit
- S4 algebra, a variety of modal algebras, also called Interior algebra
- Tetrahedral symmetry, the symmetric group S4
- S4 (modal logic), a normal modal logic
ChemistryEdit
- S4: Keep away from living quarters, a safety phrase in chemistry
- Tetrasulfur (S4), an allotrope of sulfur
- Andarine (S-4), a selective androgen receptor modulator and experimental drug
BiologyEdit
- Fourth heart sound, or S4, an abnormal heart sound often indicative of congestive heart failure or cor pulmonale
- Fourth sacrum of the vertebral column in human anatomy
- Sacral spinal nerve 4, a spinal nerve of the sacral segment
TechnologyEdit
- S (programming language) version 4
- Hibernation a sleeping state in a computer
- SG2 Shareable (Fire Control) Software Suite (S4)
- Nikon Coolpix S4, a camera
- Samsung Galaxy S4, a smartphone
- Samsung Galaxy S4 Mini, a mini version of the Samsung Galaxy S4
- Samsung Galaxy Tab S4, an Android tablet
TransportationEdit
RoutesEdit
- S4 (Berlin), an S-Bahn line
- S4 (Munich), an S-Bahn line
- S4 (Nuremberg), an S-Bahn line
- S4 (Rhine-Main S-Bahn), an S-Bahn line
- S4 (Rhine-Ruhr S-Bahn), an S-Bahn line
- S4 (St. Gallen S-Bahn), an S-Bahn line in Switzerland
- S4 (RER Vaud), an S-Bahn line in Switzerland
- S4 (ZVV) line S4, a line of the S-Bahn Zürich in Switzerland
- Bremen S-Bahn line S4
- Hanover S-Bahn line S4
- Rhine-Neckar S-Bahn line S4
- Rostock S-Bahn line S4, a 2010-planned future line
- Stadtbahn Karlsruhe line S4
- Stuttgart S-Bahn line S4
- S4, a line of the Brussels Regional Express Network
VehiclesEdit
- Alco S-4, a locomotive
- Audi S4, a car
- Lancia Delta S4, a 1984 Group B rally car
- Hydra Technologies Ehécatl, S4, a Mexican unmanned aerial vehicle
- Letov Š-4, a 1923 Czechoslovak aircraft
- Prussian S 4, an 1894 steam locomotives class
- Seibel S-4, a 1951 helicopter
- Supermarine S.4, a 1925 British seaplane
- USS S-4 (SS-109), a 1919 US Navy submarine
Groups, companies, organizationsEdit
- S04, FC Schalke 04, a German professional sports club
- Shift4 Payments, a U.S. payment processor
- SATA International (IATA airline designator "S4"), Azores Airlines
OtherEdit
- S4 (classification), 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)