A5 and variants may refer to:

Science

• A5 regulatory sequence in biochemistry
• Annexin A5, a human cellular protein
• ATC code A05 Bile and liver therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System
• British NVC community A5 (Ceratophyllum demersum community), a British Isles plants community
• Subfamily A5, a Rhodopsin-like receptors subfamily
• A5 (neuroanatomy), a noradrenergic cell group located in the Pons
• A5 pod, a name given to a group of orcas (Orcinus orca) found off the coast of British Columbia, Canada
• A5, the strain at fracture of a material as measured with a load test on a cylindrical body of length 5 times its diameter
• A₅, the alternating group on five elements

Sport and recreation

• A5 grade (climbing)
• A5, an aid climbing gear manufacturer - absorbed by The North Face
• A05, R ti Opening Encyclopaedia of Chess Openings code
• A-5, a common shorthand name for the Browning Auto-5 shotgun
• Gibson A-5 mandolin, a Gibson mandolin
• Tippmann A-5, a semi-automatic pneumatic marker for playing paintball

Transport

Automobiles

• Chery A5, a 2006 Chinese car
• Audi A5, a 2007 luxury coup
• Arrows A5, a 1982 British racing car

Other

• A5 road, in several countries q/v/
• Hall-Scott A-5, an engine powering the 1916 Standard H-2 aircraft
• Prussian A 5, a 1913 German railbus
• Route A5 (WMATA), a bus route operated by the Washington Metropolitan Area Transit Authority
• Airlinair, by IATA code
• Bhutan, by aircraft registration code

Military

Aircraft

• A-5, an export version of Nanchang Q-5, a Chinese-built jet fighter bomber
• Curtiss Falcon or A-5 Falcon, an attack aircraft manufactured by the Curtiss Aircraft Company
• Mitsubishi A5M, a 1930s Japanese fighter plane
• A-5 Vigilante, a carrier-based supersonic bomber designed for the United States Navy
• Focke-Wulf A 5, a WWI German Focke-Wulf aircraft

Other

• USS A-5 (SS-6) or USS Pike (SS-6), a 1903 United States Navy Plunger-class submarine
• HMS A5, an A-class submarine of the Royal Navy
• Aggregate 5, a German rocket design, scaled down precursor to the V-2, in World War II
• A 5, a Swedish regiment designation, see list of Swedish artillery regiments
• A5, the staff designation for air force headquarters staff concerned with plans or strategy
  • In the United Kingdom, the Joint Force Air Component Headquarters A5 - Air Strategy and GAT branch
• A5 Juggernaut, an armored fighting vehicle in the Star Wars fictional universe

Other

• A5 paper size, an ISO 216 international standard paper size (148 210 mm)
• In Town and country planning in the United Kingdom, A5 is the code for permission to use specific land or premises for takeaways
• Apple A5, the Apple mobile microprocessor

See also

• A5/1, A5/2 and A5/3, ciphers used in cellular phones
• AV (disambiguation)

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