S4
S4, S 4, Š-4, S.4 or S-4 may refer to:
People
Places
Science and mathematics
Mathematics
Chemistry
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
Transportation
Routes
- 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
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
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
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