IDF

IDF or idf may stand for:

"idf" can be: short for "identifier"
short for "identification"

Acronyms

Intel Developer Forum
Intermediate Data Format, a file format for transferring 3D electronics data between programs
Intermediate distribution frame (in Telephony and Computer networking) - a cable rack that interconnects and manages the telecommunications wiring between a main distribution frame (MDF) and workstation devices
Inverse Document Frequency, a factor in the tf–idf principle, used in Information Retrieval
Invention Disclosure Form, a precursor to filing a patent application
The International DOI Foundation developing Digital Object Identifier (DOI)
International Diabetes Federation

Medical

Immune Deficiency Foundation
International Diabetes Foundation

Military

the Israel Defense Forces
the Iceland Defense Force
the Irish Defence Forces
Indigenous Defence Fighter, also known as AIDC F-CK-1 Ching-kuo, a light fighter aircraft by the Aerospace Industrial Development Corporation (AIDC) for the Republic of China (Taiwan) Air Force
Indirect fire

Geographic areas

Île-de-France (province) (historical) of France
Île-de-France (région) of France

Translation

The word "IDF" occurs as such in the following languages: English, Czech, German, French, Italian, Dutch, Japanese, Portuguese, Chinese.