IDF or idf may refer to:

Defence forces

* Irish Defence Forces * Israel Defense Forces * Iceland Defense Force, of the US Armed Forces, 1951-2006 *

Indian Defence Force The Indian Defence Force (IDF) was a part-time defence force established as part of the Indian Army in 1917 in order to release regular troops from garrison duties during the First World War. It was divided into British and Indian sections. L ...

, a part-time force, 1917

Organizations

* Israeli Diving Federation * Interaction Design Foundation * International Diabetes Federation * International DOI Foundation, of the digital object identifier

Places

Idiofa Airport Idiofa Airport is an airport serving Idiofa, a city in Kwilu Province, Democratic Republic of the Congo. See also * * * Transport in the Democratic Republic of the Congo * List of airports in the Democratic Republic of the Congo References ...

, Idiofa, Democratic Republic of the Congo (IATA airport code) *

Île-de-France The Île-de-France (, ; literally "Isle of France") is the most populous of the eighteen regions of France. Centred on the capital Paris, it is located in the north-central part of the country and often called the ''Région parisienne'' (; en, Pa ...

, region of France

Other uses

* Intensity-duration-frequency curve, for rainfall *

Intel Developer Forum The Intel Developer Forum (IDF) was a biannual gathering of technologists to discuss Intel products and products based on Intel products. The first IDF was held in 1997. To emphasize the importance of China, the Spring 2007 IDF was held in Beij ...

Intermediate Data Format Intermediate Data Format (IDF) files are used interoperate between electronic design automation (EDA) software and solid modeling mechanical computer-aided design Computer-aided design (CAD) is the use of computers (or ) to aid in the creat ...

, a file format for electronic design automation *

Intermediate distribution frame An intermediate distribution frame (IDF) is a distribution frame in a central office or customer premises, which cross connects the user cable media to individual user line circuits and may serve as a distribution point for multipair cables f ...

, for telecommunications wiring * AIDC F-CK-1 Ching-kuo, Indigenous Defense Fighter, Taiwanese aircraft *Inverse Document Frequency, a factor in the

tf–idf In information retrieval, tf–idf (also TF*IDF, TFIDF, TF–IDF, or Tf–idf), short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or ...

principle *

Indirect fire Indirect fire is aiming and firing a projectile without relying on a direct line of sight between the gun and its target, as in the case of direct fire. Aiming is performed by calculating azimuth and inclination, and may include correcting ai ...

(''see also'' Glossary of military abbreviations#I)