FIR

FIR or fir may refer to:

• Fir, a type of conifer tree
• USCGC Fir, either of two buoy tenders of the United States Coast Guard
• Fir (mathematics), free ideal ring (a mathematical concept)

Acronyms/Initialisms

• Falling In Reverse, a post-hardcore band
• Fahrner Image Replacement, a method in web design used for replacing text with an image using style sheets
• Far infrared, infrared radiation of long wavelength (>15-1,000 µm), far from visible region
• Fast Infrared, see Infrared Data Association
• Federazione Italiana Rugby, the Italian Rugby Federation, which is the rugby union governing body in Italy
• Finite impulse response, a digital filter type
• F.I.R., a Mandarin pop music group from Taiwan
• F.I.R. (TV series), a daily comedy TV series that airs on SAB TV in India
• F.I.R (1999 film), a Malayalam action film
• First Information Report, a written document prepared by the police in Bangladesh, India, Pakistan and Japan, after a crime is reported
• Flight information region, a type of airspace
• Focused ion beam, type of beam
• Forschungsinstitut für Rationalisierung, the Research Institute for Operations Management in English
• Free ideal ring in mathematics
• French Indian rupee, defunct currency in French India
• Left Revolutionary Front (disambiguation) (Frente de Izquierda Revolucionaria)

Or see

• FIRS
• All pages beginning with "Fir"