FIR

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.

This page concerning a three letter acronym is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.

FIR

See also: FIR, Airspace, Digital filter, F.I.R., Far infrared, Finite impulse response, First Information Report, Flight Information Region, India