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AAR or Aar may refer to:


Geography

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Aar AAR or Aar may refer to: Geography * Aar, a river in Switzerland, tributary of the Rhine *Aar (Lahn), a tributary of Lahn river in Germany, descending from the Taunus mountains * Aar (Dill), a tributary of Dill river in Germany, also in the bas ...
, a river in Switzerland, tributary of the Rhine *
Aar (Lahn) The Aar is a river in western Germany, left tributary of the Lahn. It rises in the Taunus mountains, near Taunusstein. It flows generally north through the towns Taunusstein, Bad Schwalbach, Aarbergen and Hahnstätten. It flows into the Lahn in D ...
, a tributary of Lahn river in Germany, descending from the Taunus mountains *
Aar (Dill) Aar is a river of Hesse, Germany. It flows for into the Dill near Herborn. Tributaries The tributaries of the Aar are as follows: *Brühlsbach (right) - 3.3 km *Stadterbach (left) - 6.6 km *Wilsbach (right) - 6.3 km *Weidbach (right) - 5.9 ...
, a tributary of Dill river in Germany, also in the basin of the Lahn *
Aar (Ill) The Aar is a river in the administrative district of Bas-Rhin which crosses the municipalities of Strasbourg and Schiltigheim. It is an arm which separates from the Ill at the University bridge to rejoin it at lock no 51 in Schiltigheim. Together ...
, a branch of the Ill river that separates from it in Strasbourg, France and rejoins it further north *
Aar (Twiste) The Twiste is a river of Hesse and of North Rhine-Westphalia, Germany. It is the most important tributary of the Diemel, which it joins in Warburg. Its largest tributaries are the Erpe, Watter, Aar and Wande. See also *List of rivers of Hesse ...
, a tributary of Twiste river in Germany, in the basin of the Weser *
Aar (village) Aar is a village located in Girwa Tehsil of Udaipur district in the Indian state of Rajasthan Rajasthan (; lit. 'Land of Kings') is a state in northern India. It covers or 10.4 per cent of India's total geographical area. It is the l ...
, a village in Rajasthan, India * South American–Antarctic Ridge, also known as the American–Antarctic Ridge, a mid-ocean ridge in the South Atlantic *
Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest contine ...
, IAAF code AAR


Military

* After-action review, a structured review process used by the U.S. military * After action report, a retrospective analysis * Air-to-air refueling, the process of transferring aviation fuel from one military aircraft to another during flight * Assistant Automatic Rifleman, a soldier who carries ammunition, see Rifleman#Modern_tactics.


Organizations

* All American Racers, a former Formula 1 and CART team *
Allens (law firm) Allens is an international commercial law firm that operates in the Asia-Pacific region. The firm is one of the largest in the Asia-Pacific region and has many high-profile political, judicial and corporate alumni. Operations Allens has 149 p ...
, a law firm (formerly known as Allens Arthur Robinson) * American Academy in Rome, research and arts institution in Rome *
American Academy of Religion The American Academy of Religion (AAR) is the world's largest association of scholarly method, scholars in the List of academic disciplines, field of religious studies and related topics. It is a nonprofit member association, serving as a profes ...
, an association of academics who research or teach topics related to religion *
Association for Automated Reasoning The Association for Automated Reasoning (AAR) is a non-profit corporation that serves as an association of researchers working on automated theorem proving, automated reasoning, and related fields. It organizes the CADE and IJCAR conferences and p ...
, a non-profit that seeks to advance the field of automated reasoning * Association of American Railroads, an industry trade group representing the railroads of North America


Transportation

* AAR Corporation, an American aviation engineering company *
AAR coupling Janney couplers are a semi-automatic form of railway coupling that allow rail cars and locomotives to be securely linked together without rail workers having to get between the vehicles. They are also known as American, AAR, APT, ARA, MCB, knuck ...
, railway coupling specification of the Association of American Railroads *
AAR wheel arrangement The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC classification, it is widely used in ...
, Association of American Railroads system for describing wheel arrangement of locomotives *
All-American Road A National Scenic Byway is a road recognized by the United States Department of Transportation for one or more of six "intrinsic qualities": archeological, cultural, historic, natural, recreational, and scenic. The program was established by Co ...
, a designation for some national scenic byways in the United States *
Ann Arbor Railroad (disambiguation) Ann Arbor Railroad may refer to: *Ann Arbor Railroad (1895–1976), one of the bankrupt railroads that was reorganized in 1976 *Ann Arbor Railroad (1988) The Ann Arbor Railroad is a Class III Railroad that operates fifty miles of track from Tole ...
*IATA airport code for Aarhus Airport in Tirstrup, Denmark *ICAO airline code for Asiana Airlines of South Korea


Other uses

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Aar (Star Wars) ''The Han Solo Trilogy'' is a trilogy of now non-canon ('Legends') science-fiction novels set in the ''Star Wars'' galaxy. It follows Han Solo's origins and life before the events depicted in the original ''Star Wars'' trilogy (1977–1983). Th ...
, fictional planet in ''Star Wars'' universe *Aar, a fictional planet of the star Deneb, in the "
Captain Future Captain Future is a pulp science fiction hero — a space-traveling scientist and adventurer —originally published in his namesake pulp magazine from 1940 to 1944. The character was created by editors Mort Weisinger and Leo Margulies. The maj ...
" stories * The All-American Rejects, an American rock band * Air America Radio, a domestic United States radio network *
Average accounting return The average accounting return (AAR) is the average project earnings after taxes and depreciation, divided by the average book value of the investment during its life. Approach to making capital budgeting decisions involves the average accounting ret ...
, a capital budgeting investment rule *
Adam's apple reduction Chondrolaryngoplasty (commonly called tracheal shave) is a surgical procedure in which the thyroid cartilage is reduced in size by shaving down the cartilage through an incision in the throat, generally to aid those who are uncomfortable with the g ...
, a surgery *
Afar language The Afar language ( aa, Qafaraf, links=no; also known as ’Afar Af, Afaraf, Qafar af) is an Afroasiatic language belonging to the Cushitic branch. It is spoken by the Afar people inhabiting Djibouti, Eritrea and Ethiopia. Classification Afar ...
(ISO 639 language identification code) *'' African American Review'', a journal * Amino acid response, the biochemical response of a mammalian cell starved of amino acids *"At any rate", see List of SMS abbreviations *
Alkali–aggregate reaction Surface of a concrete pillar with crack pattern of alkali–silica reaction Alkali–aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silico ...
, a chemical reaction leading to expansion in concrete


See also

*
Ahr Ahr () is a river in Germany, a left tributary of the Rhine. Its source is at an elevation of approximately above sea level in Blankenheim in the Eifel, in the cellar of a timber-frame house near the castle of Blankenheim. After it crosses fro ...
, a river in Germany, tributary of the Rhine * Aare (disambiguation) {{Disambiguation, geo