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=                                SDF                                 =
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                            Introduction
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SDF may refer to:


File formats
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* Simple Data Format, for binary data
* Spatial Data File, for geodatabases
* Standard Delay Format, for timing data
* SQL Server Compact Edition Database File (filename extension: .sdf)
* Structure data file, for chemical tables
* Scientific Data Format, a Hierarchical Data Format implementation


Formal computer science
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* Signed distance function (or field), in mathematical applications
* Syntax Definition Formalism, to describe formal languages


Other uses in computing
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* Software development folder, a physical or virtual container for
software project artifacts
* Synchronous Data Flow, a restriction of Kahn process networks
* SDF Public Access Unix System, a shared shell provider


                      Entertainment and media
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* Südtirol Digital Fernsehen, a TV station in South Tyrol, Italy
* Super Dimensional Fortress, warships in the Robotech/Macross
franchise
* Settlement Defense Front (SDF), an enemy faction of 'Call of Duty:
Infinite Warfare'


Military forces
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* Japan Self-Defense Forces
* State defense force, US
* Sudan Defence Force, 1925-1955
* Syrian Democratic Forces, North and East Syria


Political parties
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* Sikkim Democratic Front, India
* Social Democratic Federation (United States), 1936-1956
* Social Democratic Federation, UK, 1884-1911
* Social Democratic Forum, Hong Kong, 2000
* Social Democratic Front (disambiguation), Cameroon and Ghana
* Socialist Democratic Federation (Japan), 1978-1994


Other organizations
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* Scouts de France, youth group
* Serb Democratic Forum, Serbs of Croatia
* Search Dog Foundation, rescue dog training organization


                               Places
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* Louisville International Airport, Kentucky, US (by IATA code)
* Soquel Demonstration State Forest, California, US


                              Science
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* Silver diammine fluoride, in dentistry
* Stromal cell-derived factor (disambiguation), SDF1, SDF1a, etc.
* Subwavelength-diameter optical fibre
* Synchronous diaphragmatic flutter or hiccup


                             Other uses
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* SDF Group (SAME Deutz-Fahr), an Italian-based agricultural machine
manufacturer
* Simplified directional facility, an aviation instrument approach
navigational aid
* Stochastic discount factor, in econometrics


License
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