A12

A12, A.12 or A-12 may refer to:

Aviation

• A-12 Avenger II, a Cold War-era, American aircraft project that was canceled prior to production
• A-12 Shrike, a World War 2–era American attack aircraft
• Abrial A-12 Bagoas, a French, experimental glider of the 1930s
• Aero A.12, a Czechoslovak light bomber built after World War 1
• Lockheed A-12, codenamed Oxcart, a high-altitude, high-speed reconnaissance aircraft, manufactured for the CIA

Military

• Aggregate 12, a German rocket design in World War 2 that was never constructed
• Matilda II (tank), built to General Staff specification A12, a British tank of World War 2

Science and Technology

• A12 Authentication, a CHAP-based mechanism used by a CDMA2000 Access Network to authenticate a 1xEV-DO Access Terminal
• ATC code A12 Mineral supplements, a subgroup of the Anatomical Therapeutic Chemical Classification System
• British NVC community A12 (Potamogeton pectinatus community), a British Isles plant community

Other

• A12 road, in several countries
• Fiat A.12, a 1916 Italian, 6–cylinder, liquid-cooled in-line engine
• HMS A12, a British A–class submarine of the Royal Navy
• LSWR A12 class, a 1887 British steam locomotive model
• Route A12 (WMATA), a bus route in Washington, USA

and also :

• One of the Encyclopaedia of Chess Openings codes for the English Opening in chess
• a Rhodopsin-like receptors subfamily