S4
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'''S4''' or '''S-4''' may refer to:
* Form S-4, a [http://www.sec.gov/about/forms/forms-4.pdf filing] required by the [[Securities and Exchange Commission]] to declare [[Mergers and Acquisitions]].[http://www.investopedia.com/terms/s/s4.asp]
*[[USS S-4 (SS-109)]], a US Navy submarine
*[[Staff (military)#Logistics_.284.29|S4 (military)]], a logistics officer within [[military unit]]s.
*S4, a sustainability trends in fashion newsletter created by model [[Summer Rayne Oakes]] and found at [http://www.S4trends.com/ S4trends.com]
* the [[normal modal logic]] [[Kripke semantics#Correspondence and completeness|S4]]
*S4 algebra, a variety of [[modal algebra]]s, also called [[Interior algebra]]
*[[S4 inc.]], Burlington, Massachusetts, top secret facility clearance mission-critical support services to customers like the Department of Homeland Security and U.S. Air Force [http://www.s4inc.com/index.html]
* S4 safety phrase, see [[List of S-phrases]]
* [[Fourth heart sound|S<sub>4</sub>]], an abnormal [[heart sounds|heart sound]] often indicative of [[congestive heart failure]] or [[cor pulmonale]]
*[[Advanced Configuration and Power Interface]] (ACPI), S4 refers to [[Hibernate (OS feature)|hibernation]], a sleeping state in which the contents of RAM are saved to a hard disk
*[[Audi S4]]
*[[SATA International]] (S4 [[IATA airline designator]])
*[[Students for saving social security]]
* Version 4 of [[S (programming language)]]
* Fourth [[sacrum|sacral vertebra]] of the [[vertebral column]], in [[human anatomy]]
* [[P4 gauge|S4]] In model railways, a highly accurate 4mm/1 ft modelling format
* [[Sector Four]] An alleged military base next to [[Area 51]], said to contain nine UFOs
* [[S4 (Munich)]] S-Bahn line in Munich
* [[S postcode area|S4 postcode]], covering areas of northern [[Sheffield]]
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