Look up fir in Wiktionary, the free dictionary.
FIR refer to:
- Finite impulse response, a digital filter type
- Forschungsinstitut für Rationalisierung, the Research Institute for Operations Management in English
- French Indian rupee, defunct currency in French India
- far infrared, infrared radiation of long wave length (>15-30 µm), far from visible region
- In India and Pakistan, First Information Report, the first report of crime filed by police
- F.I.R. (First Information Report) is a weekly comedy TV series that airs on SAB TV in India
- Flight Information Region, a type of airspace
- F.I.R., a Mandarin pop music group from Taiwan
- in web design, Fahrner Image Replacement, a method for replacing text with an image using style sheets
- Federazione Italiana Rugby, the rugby union governing body in Italy
- Infrared Data Association, Fast Infrared
- Free ideal ring in mathematics
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