SDF may refer to:

Computing

File formats

* Scientific Data Format, an implementation of the HDF5 standard *

Simple Data Format Simple Data Format (SDF) is a platform-independent, precision-preserving binary data I/O format capable of handling large, multi-dimensional arrays. It was written in 2007 by George H. Fisher, a researcher at the Space Sciences Laboratory at UC B ...

, binary data format *

Spatial Data File The Spatial Data File (SDF) is a single-user geodatabase file format developed by Autodesk. The file format is the native spatial data storage format for Autodesk GIS programs MapGuide and AutoCAD Map 3D. SDF format version SDF3 (based on SQLite3 ...

, a geodatabase file format * Standard Delay Format, for timing data *

SQL Server Compact Edition Database File Microsoft SQL Server Compact (EOL, See SQL Express) (SQL CE) is a Data compaction, compact relational database produced by Microsoft for applications that run on mobile devices and desktops. Prior to the introduction of the desktop platform, it was ...

, extension *

Structure data file Chemical table file (CT File) is a family of text-based chemical file formats that describe molecules and chemical reactions. One format, for example, lists each atom in a molecule, the x-y-z coordinates of that atom, and the bonds among the atoms. ...

, a chemical table file format

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 Super Dimension Fortress (SDF, also known as freeshell.org) is a non-profit public access UNIX shell provider on the Internet. It has been in continual operation since 1987 as a non-profit social club. The name is derived from the Japanese an ...

, 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

Organizations

Military forces

Japan Self-Defense Forces The Japan Self-Defense Forces ( ja, 自衛隊, Jieitai; abbreviated JSDF), also informally known as the Japanese Armed Forces, are the unified ''de facto''Since Article 9 of the Japanese Constitution outlaws the formation of armed forces, the ...

* State defense force, US *

Sudan Defence Force The Sudan Defence Force (SDF) was a locally recruited British-led force formed in 1925 to assist the police in the event of civil unrest, and to maintain the borders of British administered Sudan. During the Second World War, it also served bey ...

, 1925–1955 *

Syrian Democratic Forces , war = the Syrian Civil War , image = Flag of Syrian Democratic Forces.svgborder , caption = Flag , active = 10 October 2015 – present , ideology = DemocracyDecentralizationSecularism ...

, North and East Syria

Political parties

* Sikkim Democratic Front, India *

Social Democratic Federation (United States) The Social Democratic Federation of the United States of America (SDF) was a political party in the United States, formed in 1936 by the so-called "Old Guard" faction of the Socialist Party of America. The SDF later merged again with the Social ...

, 1936–1956 *

Social Democratic Federation The Social Democratic Federation (SDF) was established as Britain's first organised socialist political party by H. M. Hyndman, and had its first meeting on 7 June 1881. Those joining the SDF included William Morris, George Lansbury, James Con ...

, UK, 1884–1911 *

Social Democratic Forum The Social Democratic Forum (, SDF) was a short-lived political group in Hong Kong formed by the radical faction of the Democratic Party. It consisted mostly the "Young Turks" faction of the Democratic Party which took a more pro-grassroots and str ...

, Hong Kong, 2000 *

Social Democratic Front (disambiguation) Social Democratic Front may refer to: * Social Democratic Front (Cameroon), the main opposition party of Cameroon * Social Democratic Front (Ghana) The Social Democratic Front (SDF) was a political party in Ghana during the Third Republic (1979� ...

, Cameroon and Ghana * Socialist Democratic Federation (Japan), 1978–1994

Other organizations

Scouts de France Scouts et Guides de France (''Scouts and Guides of France'', SGdF) is the largest Scouting and Guiding association in France. It was formed on 1 September 2004 from the merger of two Roman Catholic Scouting organizations: the Guides de France ( ...

, youth group * Serb Democratic Forum, Serbs of Croatia

Places

* Louisville International Airport, Kentucky, US (by IATA code) *

Soquel Demonstration State Forest Soquel Demonstration State Forest (SDSF or SDF) is one of eight Cal Fire operated Demonstration State Forests totaling 71,000 acres. Collectively, the forests represent the most common forest types in the state. The State Forests grow approxim ...

, California, US

Science

Silver diammine fluoride Silver diammine fluoride (SDF), also known as silver diamine fluoride in most of the dental literature, (although this is a chemical misnomer) is a topical medication used to treat and prevent dental caries (tooth decay) and relieve dentinal hype ...

, in dentistry *

Stromal cell-derived factor (disambiguation) There are several stromal cell derived factors: * Stromal cell-derived factor-1 The stromal cell-derived factor 1 (SDF-1), also known as C-X-C motif chemokine 12 (CXCL12), is a chemokine protein that in humans is encoded by the ''CXCL12'' gene o ...

, SDF1, SDF1a, etc. *

Subwavelength-diameter optical fibre A subwavelength-diameter optical fibre (SDF or SDOF) is an optical fibre whose diameter is less than the wavelength of the light being propagated through it. An SDF usually consists of long thick parts (same as conventional optical fibres) at both ...

Synchronous diaphragmatic flutter A hiccup (scientific name ''singultus'', from a Latin word meaning "to catch one's breath while sobbing"; also spelled hiccough) is an involuntary contraction (myoclonic jerk) of the diaphragm that may repeat several times per minute. The hic ...

or hiccup

Other uses

SDF Group SDF Group is an Italian agricultural machinery manufacturer founded in 1927 and with its headquarters in Treviglio (Bergamo), Italy. SDF is one of the world's leading manufacturers of tractors, combine harvesters, and diesel engines. The group's p ...

(SAME Deutz-Fahr), an Italian-based agricultural machine manufacturer * Simplified directional facility, an aviation instrument approach navigational aid *

Stochastic discount factor The concept of the stochastic discount factor (SDF) is used in financial economics and mathematical finance. The name derives from the price of an asset being computable by "discounting" the future cash flow \tilde_i by the stochastic factor \tilde, ...

, in econometrics {{disambiguation