English abbreviations from iff-sif to ifr
- IFF/SIF(Identification Friend or Foe/Selective Identification Feature)
- IFFC(Integrated Fire and Flight Control)
- IFFCC(Integrated Flight and Fire Control Computer)
- IFFD(International Federation for Family Development)
- IFFN(Identification, Friend, Foe, or Neutral)
- IFIP(International Federation of Information Processing)
- IFIS(Integrated Functional Imaging System)
- IFJ(Ísafjörður Airport)
- IFL(Innisfail Airport)
- IFM(Instantaneous Frequency Measurement)
- IFMC(Iowa Foundation for Medical Care)
- IFMGA(International Federation of Mountain Guides Associations)
- IFMSA(International Federation of Medical Students' Associations)
- IFN(Esfahan Shahid Beheshti International Airport)
- IFNA(International Federation Netball Association)
- IFO(Identified Flying Object (see also UFO))
- IFOA(International Festival Of Authors)
- IFOB(International Friends Of Belize)
- IFOG(Interferometric Fiber Optic Gyro)
- IFOR(UN Implementation Force|| Institute for Operations Research||International Fellowship of Reconciliation)
- IFOV(Instantaneous Field of View)
- IFP(Laughlin/Bullhead International Airport)
- IFPA(Intermediate-Frequency Pre-Amplifier)
- IFPI(International Federation of Phonographic Industries)
- IFPRI(International Food Policy Research Institute)
- IFQT(Informal Qualification Test)
- IFR(Instrument Flight Rules)
