SDF may refer to:

Computing

File formats

* Scientific Data Format, an implementation of the

HDF5 Hierarchical Data Format (HDF) is a set of file formats (HDF4, HDF5) designed to store and organize large amounts of data. Originally developed at the U.S. National Center for Supercomputing Applications, it is supported by The HDF Group, a non-p ...

standard * Simple Data Format, 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 Standard Delay Format (SDF) is an IEEE standard for the representation and interpretation of timing data for use at any stage of an electronic design process. It finds wide applicability in design flows, and forms an efficient bridge between dynamic ...

, 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, a chemical table file format

Computer science

Signed distance function In mathematics and its applications, the signed distance function (or oriented distance function) is the orthogonal distance of a given point ''x'' to the boundary of a set Ω in a metric space, with the sign determined by whether or not ''x' ...

(or field), in mathematical applications *

Syntax Definition Formalism The Syntax Definition Formalism (SDF) is a metasyntax used to define context-free grammars: that is, a formal way to describe formal languages. It can express the entire range of context-free grammars. Its current version is SDF3. A parser and parse ...

, to describe formal languages

Other uses in computing

* Software development folder, a physical or virtual container for software project artifacts *

Synchronous Data Flow Synchronous Data Flow (SDF) is a restriction on Kahn process networks where the number of tokens read and written by each process is known ahead of time. In some cases, processes can be scheduled such that channels have bounded FIFOs. Limitatio ...

, 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 anim ...

, a shared shell provider

Entertainment and media

Südtirol Digital Fernsehen Südtirol Digital Fernsehen (SDF) is an Italian private television channel based in Bolzano (german: Bozen), in the autonomous province of South Tyrol ( it, Alto Adige, german: Südtirol). It is the province's only private channel broadcast in Germ ...

, a TV station in South Tyrol, Italy * Super Dimensional Fortress, warships in the

Robotech ''Robotech'' is a science fiction franchise that began with an 85-episode anime television series produced by Harmony Gold USA in association with Tatsunoko Production and first released in the United States in 1985. The show was adapted from t ...

Macross is a Japanese science fiction mecha anime media franchise/media mix, created by Studio Nue (most prominently mecha designer, writer and producer Shōji Kawamori) and Artland in 1982. The franchise features a fictional history of Earth and the ...

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 In the United States, state defense forces are military units that operate under the sole authority of a state government. State defense forces are authorized by state and federal law and are under the command of the governor of each state. ...

, 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 Sikkim Democratic Front (SDF) is a regional political party in the Indian state of Sikkim. It was the ruling party in Sikkim from 12 December 1994 to 23 May 2019. History The party was founded by Pawan Kumar Chamling in 1993. It has ruled the ...

, 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) The (SDF), also referred to in Japanese by the shortened , was a Japanese political party that existed from 1978 to 1994. It was formed from the merger of the and the . History The Socialist Democratic Federation was a splinter party of the ...

, 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 (f ...

, youth group *

Serb Democratic Forum Serb Democratic Forum ( sh, Srpski demokratski forum, Српски демократски форум) is a non-governmental organization of the Serbs of Croatia, which in cooperation with national and international organizations and institutions, ...

, Serbs of Croatia

Places

Louisville International Airport Louisville Muhammad Ali International Airport , formerly known as simply Louisville International Airport, is a civil-military airport in Louisville in Jefferson County, Kentucky. The airport covers and has three runways. Its IATA airport code ...

, 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 approxima ...

, 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 or hiccup

Other uses

* SDF Group (SAME Deutz-Fahr), an Italian-based agricultural machine manufacturer *

Simplified directional facility Simplified directional facility (SDF) is a localizer-based instrument non-precision approach to an airport, which provides final approach course similar to instrument landing system (ILS) and localizer type directional aid (LDA) approaches, altho ...

, 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