• fir
  Fir
  Firs are a genus of 48–55 species of evergreen conifers in the family Pinaceae. They are found through much of North and Central America, Europe, Asia, and North Africa, occurring in mountains over most of the range...
  
  , a type of conifer tree
• USCGC Fir
  USCGC Fir
  Two buoy tenders of the United States Coast Guard have borne the name USCGC Fir. — built in 1938 and decommissioned in 1991. — launched in August 2003....
  
  , either of two buoy tenders of the United States Coast Guard
• Fir (mathematics), free ideal ring (a mathematical concept)

Acronyms

• Falling In Reverse
  Falling in Reverse
  Falling in Reverse is an American post-hardcore band signed to Epitaph Records. They released their debut album, The Drug in Me Is You, on July 26, 2011, which peaked at number 19 one the Billboard 200, selling 18,000 copies in its first week of sales. "Raised by Wolves", "The Drug in Me Is You",...
  
  , a post-hardcore band
• Fahrner Image Replacement
  Fahrner Image Replacement
  Fahrner Image Replacement is a Web design technique that uses Cascading Style Sheets to replace text on a Web page with an image containing that text...
  
  , a method in web design used for replacing text with an image using style sheets
• Far infrared, infrared radiation of long wave length (>15-30 µm), far from visible region
• Fast Infrared, see Infrared Data Association
  Infrared Data Association
  The Infrared Data Association defines physical specifications communications protocol standards for the short-range exchange of data over infrared light, for uses such as personal area networks ....
  
  
• Federazione Italiana Rugby, the Italian Rugby Federation, which is the rugby union governing body in Italy
• Finite impulse response
  Finite impulse response
  A finite impulse response filter is a type of a signal processing filter whose impulse response is of finite duration, because it settles to zero in finite time. This is in contrast to infinite impulse response filters, which have internal feedback and may continue to respond indefinitely...
  
  , a digital filter type
• F.I.R.
  F.I.R.
  F.I.R. is a Taiwanese Mandopop pop rock band. The band currently consists of Faye Chan , Ian Chen and Real Huang . Producer Ian Chen formed his own band and recruited the other two members to form F.I.R. They are well known throughout Asia with their hit "Lydia", which was the theme song for the...
  
  , a Mandarin pop music group from Taiwan
• F.I.R., a weekly comedy TV series that airs on SAB TV in India
• First Information Report
  First Information Report
  A First Information Report or FIR is a written document prepared by the police in India, Pakistan and Japan when they receive information about the commission of a cognizable offence. It is a report of information that reaches the police first in point of time and that is why it is called the First...
  
  , the first written document prepared by the police in India, Pakistan and Japan, after a crime is reported
• Flight Information Region
  Flight Information Region
  In aviation a flight information region is a region of airspace with specific dimensions, in which a flight information service and an alerting service are provided. It is the largest regular division of airspace in use in the world today....
  
  , a type of airspace
• Forschungsinstitut für Rationalisierung, the Research Institute for Operations Management
  Research Institute for Operations Management
  FIR is an associated research institute at RWTH Aachen, Germany. FIR has three main departments Information Management, Production Management and Service Management. FIR actively contributes to the European and German research communities as well as to the German industry...
  
   in English
• Free ideal ring
  Free ideal ring
  In mathematics, especially in the field of ring theory, a free ideal ring, or fir, is a ring in which all left ideals are free of unique rank. A ring such that all left ideals with at most n generators is free of unique rank is called an n-fir. A semifir is a ring in which all finitely generated...
  
   in mathematics
• French Indian rupee
  French Indian rupee
  The roupie or rupee was the currency of French India. It was equal to the Indian rupee issued by the British and then Indian governments. Until 1871 it was issued as coins with the roupie divided into 8 fanons, each of 3 doudous or 20 cash...
  
  , defunct currency in French India
• Frente de Izquierda Revolucionaria