S4

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

People

• S4 (gamer), Gustav Magnusson, Swedish Dota 2 player
• S4 (military), a logistics officer within military units

Places

• County Route S4 (California), a road in San Diego, California

Science and mathematics

Mathematics

• S4 algebra, a variety of modal algebras, also called Interior algebra
• Tetrahedral symmetry, the symmetric group S₄
• S4 (modal logic), a normal modal logic

Chemistry

• 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

Biology

• 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

Technology

• S (programming language) version 4
• Hibernation (computing) a sleeping state in a computer
• SG2 Shareable (Fire Control) Software Suite (S4)
• Nikon S4, a 1958 35 mm film rangefinder camera
• 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

Transportation

Routes

Austria

• S4, a Carinthia S-Bahn line
• S4, a Salzburg S-Bahn line that extends into Germany
• S4, a Tyrol S-Bahn line
• S4, an Upper Austria S-Bahn line
• S4, a Vienna S-Bahn line
• S4, a Vorarlberg S-Bahn line

Germany

• S4 (Berlin), a Berlin S-Bahn line
• S4 (Munich), a Munich S-Bahn line
• S4 (Nuremberg), a Nuremberg S-Bahn line
• S4 (Rhine-Main S-Bahn), a Rhine-Main S-Bahn line
• S4 (Rhine-Ruhr S-Bahn), a Rhine-Ruhr S-Bahn line
• S4, a Bremen S-Bahn line
• S4, a Hanover S-Bahn line
• S4, a Karlsruhe Stadtbahn, line
• S4, a Rhine-Neckar S-Bahn line
• S4, a planned Rostock S-Bahn line canceled in 2012
• S4, a Stuttgart S-Bahn line

Switzerland

• S4 (St. Gallen S-Bahn), a St. Gallen S-Bahn line
• S4 (RER Vaud), an old number for RER Vaud S-Bahn line R4
• S4 (ZVV), Zurich S-Bahn line

Other routes

• S4, a Brussels Regional Express Network line in Belgium
• Line S4 (Milan suburban railway service), Italy
• Line S4 (Nanjing Metro), China

Vehicles

• 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, organizations

• S04, FC Schalke 04, a German professional sports club
• Shift4 Payments, a U.S. payment processor
• Azores Airlines, by IATA airline designator

Other

• 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)

See also

• All pages with titles beginning with S4
• All pages with titles containing S4
• SSSS (disambiguation)
• 4S (disambiguation)
• S (disambiguation)
• 4 (disambiguation)