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

[edit] S₄

• Fourth heart sound, an abnormal heart sound often indicative of congestive heart failure or cor pulmonale
• Tetrasulfur, an allotrope of sulfur

Beginning with S4 [link]

• S4 standard, a standard of P4 gauge with reduced tolerance, a highly accurate 4mm/1 ft railways modeling format
• S4, a sustainability trends in fashion newsletter created by model Summer Rayne Oakes
• S4, a normal modal logic
• S4 algebra, a variety of modal algebras, also called Interior algebra
• S4: Keep away from living quarters, a safety phrase in chemistry
• S4 League, a Korean MMORPG Shooter made by Pentavision, the makers of the music video game, DJMAX
• S4 (military), a logistics officer within military units
• S postcode area, covering areas of northern Sheffield
• S-4 (Sector Four) a rumored secret military installation in Nevada

Containing S4 [link]

• Alco S-4, a locomotive
• Audi S4, a car
• British NVC community S4, a swamps and tall-herb fens in the British National Vegetation Classification system
• County Route S4 (California), a road in San Diego, California
• Form S-4, a form required by the Securities and Exchange Commission to declare Mergers and Acquisitions
• Hydra Technologies Ehécatl, S4, A Mexican Unmanned aerial vehicle (UAV) made by Hydra technologies of Mexico
• Lancia Delta S4, a 1984 Group B rally car
• Letov Š-4, a 1923 Czechoslovak single-bay unstaggared biplane fighter
• Nikon Coolpix S4, a 6.0 million pixels digital camera
• Prussian S 4, a 1894 steam locomotives class
• Rans S-4 Coyote, an ultralight aircraft
• Seibel S-4, a 1951 helicopter
• SG2 Shareable (Fire Control) Software Suite (S4), shareable fire control software developed by NATO
• Supermarine S.4, a 1925 British single-engined single-seat monoplane racing seaplane
• USS S-4 (SS-109), a 1919 US Navy submarine

S04 [link]

• S04, a code name for FC Schalke 04

As a code [link]

• hibernation a sleeping state in which the contents of RAM are saved to a hard disk (Advanced Configuration and Power Interface code)
• SATA International (IATA airline designator)
• S (programming language) version 4
• Sacral spinal nerve 4, a spinal nerve of the sacral segment
• Fourth sacrum of the vertebral column, in human anatomy
• Yamaha grand piano model S4

As an abbreviation [link]

• SOCOM 4, a 2011 video game developed by Zipper Interactive
• Sonic the Hedgehog 4, a video game by Sega
• Source Four, an ERS theatre lighting fixture by Electronic Theatre Controls
• Shareable SG2 (Fire Control) Software Suite (S4), a common development between NATO nations for artillery software

As a train line [link]

• Berlin S-Bahn line S4
• Bremen S-Bahn line S4
• Hanover S-Bahn line S4
• Munich S-Bahn line S4
• RheinNeckar S-Bahn line S4
• line S4 (Rhine-Ruhr S-Bahn) of the Rhein-Ruhr S-Bahn
• 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

See also [link]

• 4S (disambiguation)

This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.