A1 (Zimbabwe),Long National Route in Zimbabwe

A1 means "very good" or in the best possible condition. It is usually considered to derive from the shipping insurers, Lloyds of London's description of "A1 at Lloyd's", a first class ship. It was also a term popularised by the British War Office ABC system of classification for recruits in the First World War. A-1 recruits were considered fit for general service overseas. A1 and A-1 are often used at the start of commercial business names so that they appear first in the telephone directory. For example, "A1 Cleaning Services" or "A1 Tool Hire".

A1 Grand Prix series

A-1 Skyraider, a United States Air Force/Navy single-seat attack bomber

Battle Angel Alita, as her nickname on Tuned days.

the primary auditory cortex, that is, the part of the brain which processes hearing

A1 (rocket), a German rocket design from the 1930s

A1 was the code-name for the Microsoft security service Windows Live OneCare

LNER Peppercorn Class A1 a Pacific locomotive designed by A. H. Peppercorn

Bundesautobahn 1 (Germany) connecting Oldenburg (Holstein) to Saarbrücken

Canon A-1, a camera by Canon

Adventure One (A1), a TV channel owned by National Geographic

A1 Ethniki is a Greek basketball league

RTV Slovenia, the first programme of Radio Slovenia

The first level achieved in the Common European Framework of Reference for Languages when learning a language

TCSEC, A security class

A1 (comic) is a British anthology comic

A1 is the designation for the Majority of the Highway 1 route in Australia.

Alastair Ralphs (professional wrestler) (born 1977), as one of his stage names

America One, a television network in the United States

USS Plunger (SS-2), the lead ship of the Plunger class submarine series

A1 autoroute (France)

A1 Motorway (Italy), connecting Milan to Naples

HMS A1, a British A class submarine of the Royal Navy

A1 road (Northern Ireland), connecting Belfast to Newry and to Dublin in the Republic of Ireland via the N1/M1.

A1 (Switzerland), connecting St. Margrethen to Geneva

A1 highway (Croatia), connecting the capital Zagreb to the second largest city located in Dalmatia, Split

A1 freeway (Romania), connecting Bucharest to Piteşti

Audi A1

A1 motorway (Slovenia), connecting Maribor to Koper via Ljubljana

A1 Steak Sauce, a brand of condiment

a1 (band), a British boy band

Company A-1, An outfit in the Texas A&M Corps of Cadets

Autostrada A1 (Poland) - planned highway that will span Poland from north to south.

Trakiya motorway in Bulgaria, carrying the code A1, connecting Sofia and Burgas via Plovdiv.

National Road 1A (Vietnam), connecting the northernmost and southernmost areas of the country

A1 (theater), a soundboard operator

A1 highway (Cyprus), connecting Nicosia to Limassol

A1 (TV station) is a television channel in Macedonia

A1 highway (Lithuania), connecting Vilnius to Klaipėda

A1 road (Luxembourg), connecting Luxembourg City to the German A64

USS A-1 (SP-1370), a houseboat taken over by the United States Navy in 1917

A1 (milk), milk containing the A1 -casein protein

Autovía A-1, is a Spanish autovía connecting Madrid to Irún (French border).

A1 Westautobahn, a motorway in Austria

A1 Mine Settlement, Victoria, a town in Victoria, Australia

A1 broth, used to detect fecal coliforms

A1 - Auto-estrada do Norte, in Portugal, connecting Lisbon and Porto

A1 (shipping), a symbol indicating shipbuilding quality

USS A-1 (disambiguation), US Navy ships

A1 road (Isle of Man), connecting Douglas and Peel

A1 road (Belgium), Brussels - Antwerp - Breda

A1 paper size, paper size as defined by ISO 216

A1 Ring, the race track at which the Austrian Grand Prix was run from 1997 to 2003 (formerly called Österreichring)

0-2-2 (Whyte notation), as the equivalent UIC classification for railway locomotive wheel arrangements

HLA-A1 is a Human MHC Serotype HLA-A

LNER Class A1/A3,a locomotive designed by Sir Nigel Gresley,including the famous No. 4472 Flying Scotsman. Originally Class A1, later reclassified Class A3

A1 road (Great Britain), a key artery connecting London to Edinburgh, and many towns and cities in between. See A1 road (London) for the London sections of the road