A1
A1, A 1 or A-1 stands for:
- an address in the Mannheim A-squares
- a standardized paper size (DIN 476/ISO 216), see paper size
- a railroad line in Hamburg and Schleswig-Holstein, see AKN Eisenbahn #Streckennetz
- the driving license class for light motorcycles up to 125 cm³, see driving license
- Jet Fuel A-1, see Kerosene
- NGC 3603 A1, so far the only known star with more than 100 solar masses, see NGC 3603
- a modulation type in amplitude modulation, see amplitude modulation #short names
- a variant of the blood group allele A in the AB0 blood group system, see AB0 system
- a level of difficulty in technical climbing, see difficulty scale (climbing) #technical climbing
- a grade for civil servants in Germany, see Simple Service
- a level of the Common European Framework of Reference for Languages, see Common European Framework of Reference for Languages
- A1, sea area in the GMDSS, see Global Maritime Distress and Safety System#Sea Areas A1 to A4.
- an obsolete designation of the primary auditory cortex, now referred to as the core
- a class for the transfer speed of SD cards
- The A 1 secondment certificate in social security law
Companies, organizations, products:
- A1 (band), a British boy band
- A-1 (music distributor), a former U.S. distributor of records owned by Art Rupe
- Bregenz Handball, Austrian handball club
- A1 Ethniki, Greek Basketball Championship
- A1GP, former formula car racing series
- A1Plus film production, producer of television and other film productions
- A1 Steam Locomotive Trust, an association for a museum railroad
- A1 Steak Sauce, a steak sauce known mainly in English-speaking countries.
- A1 Telekom Austria Group (A1), Austrian telecommunications company together with its country-specific subsidiaries
- A1 Telekom Austria
- A1 Belarus
- A1 Bulgaria
- A1 Hrvatska
- A1 Slovenija
- A1 Publishing House, Munich Publishing House
- Aggregat 1, a rocket project in the Third Reich
- AMX International AMX, aircraft, in the Brazilian army A-1
- Antonov A-1, Soviet aircraft
- Audi A1, small car from Audi
- AVM A1-Card, the product name of the Berlin company AVM GmbH for an ISDN card
- Curtiss A-1, US amphibious aircraft
- Douglas A-1, US fighter bomber
- L1 A1, a British self-loading rifle
- L1 A1 (grenade launcher), a simply constructed military weapon for firing grenades.
- LNER class A1 Peppercorn, a British steam locomotive series
- Merzario A1, a Formula 1 racing car of the Italian racing team Team Merzario (1978)
Highways and trunk roads:
- Federal Motorway 1 in Germany
- West highway in Austria
- Highway 1 (Switzerland) in Switzerland
- Ring Road (Afghanistan) in Afghanistan
- Autostrada A1 (Albania) in Albania
- Avenida General Paz in Argentina
- Highway 1 (Algeria) in Algeria
- Highway 1 (Belgium) in Belgium
- A1 (Bosnia and Herzegovina) in Bosnia and Herzegovina
- A1 (Botswana) in Botswana
- Awtomagistrala Trakija in Bulgaria
- A1 (Ivory Coast) in Ivory Coast
- Autoroute A1 in France
- Aftokinitodromos 1 in Greece
- Autostrada A1 (Italy) in Italy
- A1 (Kazakhstan) in Kazakhstan
- A1 (Kenya) in Kenya
- Autocesta A1 in Croatia
- Autoceļš A1 in Latvia
- List of trunk roads in Lithuania in Lithuania
- Autoroute 1 (Luxembourg) in Luxembourg
- Highway A1 (Namibia) in Namibia
- Rijksweg 1 in the Netherlands
- A1 (Nigeria) in Nigeria
- Autostrada A1 (Poland) in Poland
- Autoestrada A1 in Portugal
- Autostrada A1 (Romania) in Romania
- Autoput A1 in Serbia
- Avtocesta A1 in Slovenia
- Autovía A-1 in Spain
- A1 road in the United Kingdom
- A1 (Cyprus)
a 1, a1 stands for:
- the note a in the pitched octave, see concert pitch
α1 or α-1 stands for:
