UDF stands for:

in aviation:

• UHF Direction Finder, a kind of radio direction finding (RDF)
• Unducted fan, a type of jet engine

in informatics: Radio Direction Finding, or RDF, is the technique of locating the direction to a radio transmission. ... RDF can refer to: Radical Dance Faction a band from the UK. Radio direction finder, a device for finding the direction to a radio source. ... General Electric GE-36 unducted fan engine on a McDonnell Douglas MD-81 testbed An unducted fan, (abbreviated as UDF), or propfan, is a modified turbofan engine with the fan placed outside of the engine nacelle on the same axis as the compressor blades. ... A Pratt and Whitney turbofan engine for the F-15 Eagle is tested at Robins Air Force Base, Georgia, USA. The tunnel behind the engine muffles noise and allows exhaust to escape. ...

• Universal Disk Format, an operation system independent file system commonly used on DVD and other digital media.
• User Defined Function, an external function which can be called from a PHP or SQL server, such as MySQL.

in politics: For other meanings of UDF, see UDF. The Universal Disk Format (UDF) is a format specification of a file system for storing files on optical media. ... DVD-R writing/reading side DVD (also known as Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... A User Defined Function, or UDF, is an extension to an SQL database server (like MySQL) that can be compiled for use in an SQL query. ... PHP is an open-source, reflective programming language used mainly for producing dynamic web content and server-side applications - including MediaWiki, the software behind Wikipedia. ... SQL (commonly expanded to Structured Query Language — see History for the terms derivation) is the most popular computer language used to create, modify and retrieve and manipulate data from relational database management systems. ... MySQL is a multithreaded, multi-user, SQL Database Management System (DBMS) with an estimated six million installations. ...

• Ulster Defence Force
• Union of Democratic Forces
• Union pour la Démocratie Française, a Christian democrat French political party.
• United Democratic Forces
• United Democratic Front, a Malawian political party
• United Democratic Front, a separate Namibian party
• United Democratic Front, a former anti-Apartheid movement in South Africa

other: The Ulster Defence Association (UDA) is a loyalist paramilitary organisation in Northern Ireland, outlawed as a terrorist group in the UK and Republic of Ireland, which is perceived by its supporters as defending the unionist community from Irish Republican terrorism. ... The Union of Democratic Forces (Bulgarian: Съюз на демократичните сили, Saiuz na demokratichnite sili) is a Bulgarian right-of-centre political party founded in December 1989 as a union of eleven political ogranizations in opposition to the Communist government. ... The Union for French Democracy, also known by its French acronym UDF (Union pour la Démocratie Française), is a French center-right political party. ... Christian Democracy is a political ideology, born at the end of the 19th century, largely as a result of the papal encyclical Rerum Novarum of Pope Leo XIII, in which the Vatican recognizes workers misery and agrees that something should be done about it, in reaction to the rise of... A political party is an organization that seeks to attain political power within a government, usually by participating in electoral campaigns. ... United Democratic Forces is a Bulgarian parliamentary coalition formed in 1997. ... Categories: Politics stubs | Liberal related stubs | Liberal parties | Malawi political parties ... A political party is an organization that seeks to attain political power within a government, usually by participating in electoral campaigns. ... The United Democratic Front is a progressive political party in Namibia. ... The United Democratic Front (UDF) was one of the most important anti-apartheid organisations of the 1980s. ... A segregated beach in South Africa, 1982. ...

• United Dairy Farmers, an American chain of ice cream shops.
• Ultra deep field, a view of the distant universe taken in 2004 by the Hubble space telescope
• Up Side Down Suspension Forks, used in Motorcycles and Mountain Bikes