| At Action Park | Attendant circumstance | At (Unix command) |
| Athletics at the 1904 Summer OlympicsAt the 1904 Summer Olympics, twenty-four athletics events were contested. Only men were competing. 60 m, Men Pos Athlete 1 Archie Hahn (USA) 2 William Hogenson (USA) 3 Fay Moulton (USA) 100 m, Men Pos Athlete 1 Archie Hahn (USA) 2 Nate Cartmell (USA) 3 Wi | Attu IslandAttu is the westernmost island in the Near Islands group of the Aleutian Islands of Alaska, making it the westernmost point of land in Alaska and the United States. Attu Station is located at 52°51' north latitude, 173°11' east longitude. It is nearly 1,7 | Atomic force microscopeThe atomic force microscope (AFM) is a very powerful microscope invented by Binnig, Quate and Gerber in 1986. Besides imaging it is also one of the foremost tools for the manipulation of matter at the nanoscale. The AFM consists of a cantilever with a sha |
| Athletics at the 1900 Summer OlympicsAt the 1900 Summer Olympics, twenty-three athletics events were contested. 60 m, Men Pos Athlete 1 Alvin Kraenzlein (USA) 2 Walter Tewksbury (USA) 3 Stanley Rowley (AUS) 100 m, Men Pos Athlete 1 Frank Jarvis (USA) 2 Walter Tewksbury (USA) 3 Stanley Rowley | ATVThe acronym ATV can refer to: all-terrain vehicle the land equivalent of a personal watercraft or jet ski amateur television a broadcast-quality television service for amateur radio operators analog television America Television a Peruvian television netw | Athos (fictional character)Athos is a fictional character in the novels The Three Musketeers Twenty Years After and The Vicomte de Bragelonne by Alexandre Dumas, pere. In The Three Musketeers he and the other two musketeers Porthos and Aramis are friends of the novel's protagonist, |
| AT-ATThe Empire Strikes Back. Also called Walkers, the All Terrain Armored Transport AT-AT was a major part of the Galactic Empire's army in the fictional Star Wars universe. AT-ATs were large, four-footed machines resembling mechanical camels. Some literature | Atomic (computer science)In computer science, an atomic operation is one that either completes fully, or has no lasting effect. It is a slightly ambiguous term: In database systems, it is one of the ACID properties. In this context, "atomic" means nothing more than the above defi | Atlanta BeatThe Atlanta Beat was a professional soccer team that played in the Women's United Soccer Association. The team played at Herndon Stadium in Atlanta, Georgia. The team began play in 2001. The league announced on September 15, 2003 it was suspending operati |
| Ataraxia | Athabasca River | Athelney |
| ATR | Attack of the Killer Tomatoes | Atlantic Central Football Conference |
| Athol (CDP), Massachusetts | Athol (town), Massachusetts | Athens (village), New York |
| Athens (town), New York | Atlantic City Expressway | Athenagoras |
| Athenagoras of Athens | Athens (disambiguation) | Atlantic Southeast Airlines |
| Atlanta Flames | Atom Heart Mother | Atimonan, Quezon |
| At the Drive-In | Atomism | ATL |
| ATR 72 | Athleta Christi | Atomization |
| Atilius | Atari Jaguar CD | Atlanta (disambiguation) |
| Atomic Kitten | Athol | Atlas Games |
| Atocha | Attica | ATS |
| Atari Games | Attica Prison riots | Athena (disambiguation) |
| Athena (video game) | Attercliffe | Attis |
| Attitude indicator | Atkins | Atlántida department |
| Athenian League | Atom Egoyan | Atiyah-Singer index theorem |
| Attorney/client privilege | Atheists in foxholes | Atrial fibrillation |
| Atami | Ateneo de Manila University | Attacks on humanitarian workers |
| Attachment Unit Interface | Attribution theory | Atypical tarantula |
| Attack of the 50 Foot Woman | Atossa | Atlantic Superstore |
| Athazagoraphobia | Ateuchosaurus | Attack on Gleiwitz radio station |
| Athens, Ontario | ATR 42 | Athole Shearer |
| Atta | Attleborough | Atomic Energy Research Establishment |
| Atlanta metropolitan area | Attitude | Atticus |
| Atlasov Island | ATX | Attic Records |
| Attitude (psychology) | Atlántico | Attercliffe Chapel |
| Atlantis: The Lost Empire | Atholl | Athabasca Tar Sands |
| Athens Wireless Metropolitan Network | Atlantic Beach | Atreus (BattleTech) |
| Atomicity | ATPG | Attica Correctional Facility |
| Atypical pneumonia | Ataxx | Atef Ebeid |
| Athaliah | Ata'ollah Mohajerani | Athletics at the 1976 Summer Olympics |
| Atzalán | Atlantic Council | Atanatári |
