SDF may refer to:

Computing

File formats

  • Spatial Data File, for geodatabases
  • Standard Delay Format, for timing data
  • SQL Server Compact Edition Database File (filename extension: <code>.sdf</code>)
  • Structure data file, for chemical tables
  • Scientific Data Format, a Hierarchical Data Format implementation

Formal computer science

  • Signed distance function (or field), in mathematical applications
  • Syntax Definition Formalism, to describe formal languages

Other uses in computing

  • 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

  • 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

Organizations

Military forces

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

Political parties

  • 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

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

Places

  • Louisville Muhammad Ali International Airport (formerly Standiford Field), Kentucky, US (by IATA code
  • Soquel Demonstration State Forest, California, US

Science

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

Other uses

  • 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