FIR
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FIR may stand for:
- finite impulse response (a property of some digital filters)
- far infrared, i.e. infrared radiation of long wave length
- In India, First Information Report, the first report of crime filed by police.
- Flight Information Region, a type of airspace
- F.I.R., the Mandarin rock music group
Also refers to military airforce controlled areas. Template:TLAdisambig