Fir

FIR may stand for:

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• 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
• in web design, Fahrner Image Replacement, a method for replacing text with an image using style sheets http://www.stopdesign.com/articles/replace_text/

Also refers to military airforce controlled areas.

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