FIR
FIR may indicate a regional railroad, an airspace flight information region, a software file representation, a finite impulse response filter, or studies of fire and insect resiliency.
Medical
Miscellaneous
Community
Fairyland In Reality
Fahrner Image Replacement
Foundation for the Investigation of Reality
For Immediate Release
Governmental
Flight Information Region
Fact Information Report
Force Information Room
Final Inspection Report
Fuel Indicating Reading
First Information Record
First-Impressions Report
Field Interrogation Reports
Fédération Internationale du Recyclage
International
Academic & Science
Far InfraRed
Finite Impulse Response
Fire and Insect Resiliency
Field Investigation Research
Far Infra-Red