Aviation

• A-12 Avenger II
  A-12 Avenger II
  The McDonnell Douglas/General Dynamics A-12 Avenger II was a proposed American ground-attack aircraft from McDonnell Douglas and General Dynamics. It was to be an all-weather, carrier-based stealth bomber replacement for the Grumman A-6 Intruder in the United States Navy and Marine Corps...
  
  , a Cold War-era, American aircraft project that was canceled prior to production
• A-12 Shrike
  A-12 Shrike
  |-See also:-References:NotesBibliography* Eden, Paul and Soph Moeng, eds. The Complete Encyclopedia of World Aircraft. London: Amber Books Ltd., 2002, ISBN 0-7607-3432-1....
  
  , a World War 2–era American attack aircraft
• Abrial A-12 Bagoas
  Abrial A-12 Bagoas
  |-References:*...
  
  , a French, experimental glider of the 1930s
• Aero A.12
  Aero A.12
  -See also:...
  
  , 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
  A12 Authentication
  A12 Authentication is a CHAP-based mechanism used by a CDMA2000 Access Network to authenticate a 1xEV-DO Access Terminal . A12 authentication occurs when an AT first attempts to access the AN and is repeated after some authentication timeout period...
  
  , a CHAP-based mechanism used by a CDMA2000 Access Network to authenticate a 1xEV-DO Access Terminal
• ATC code A12
  ATC code A12
  -A12AA Calcium:-A12AA Calcium:-A12AA Calcium::A12AA01 Calcium phosphate:A12AA02 Calcium glubionate:A12AA03 Calcium gluconate:A12AA04 Calcium carbonate:A12AA05 Calcium lactate:A12AA06 Calcium lactate gluconate:A12AA07 Calcium chloride...
  
   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
  A12 road
  The A12 is a major road in England. A trunk road for most of its length it runs from London to Great Yarmouth in Norfolk. The road forms part of the unsigned Euroroute E30...
  
  , in several countries
• Fiat A.12
  Fiat A.12
  -References:* Gunston, Bill. . World Encyclopaedia of Aero Engines. Patrick Stephens: Wellingborough. p. 62...
  
  , a 1916 Italian, 6–cylinder, liquid-cooled in-line engine
• HMS A12
  HMS A12
  HMS A12 was an early Royal Navy submarine.She was a member of Group Two of the first British A-class of submarines . As with the other members of her class, she was built at Vickers Barrow-in-Furness.-External links:*...
  
  , a British A–class submarine of the Royal Navy
• LSWR A12 class
  LSWR A12 Class
  The A12 locomotives of the London and South Western Railway were built between the years 1887 and 1895 to the design of William Adams. Ninety of the locomotives were built; numbered 527-556 ; 607-646 The A12 locomotives of the London and South Western Railway were built between the years 1887 and...
  
  , a 1887 British steam locomotive model
• Route A12 (WMATA), a bus route in Washington, USA

• One of the Encyclopaedia of Chess Openings codes for the English Opening
  English Opening
  In chess, the English Opening is the opening where White begins:A flank opening, it is the fourth most popular and, according to various databases, anywhere from one of the two most successful to the fourth most successful of White's twenty possible first moves. White begins the fight for the...
  
   in chess
• a Rhodopsin-like receptors
  Rhodopsin-like receptors
  Rhodopsin-like receptors are a family of proteins that comprise the largest group of G protein-coupled receptors.- Scope :G-protein-coupled receptors, GPCRs, constitute a vast protein family that encompasses a wide range of functions...
  
  subfamily