A5

A5 and variants may refer to:

Science and mathematics

 * A5 regulatory sequence in biochemistry
 * A5, the abbreviation for the androgen Androstenediol
 * 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
 * Noradrenergic cell group A5, 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
 * Zeolite A-5, a calcium-type molecular sieve also known as 5A.

Technology

 * Apple A5, the Apple mobile microprocessor
 * ARM Cortex-A5, ARM applications processor

Sport and recreation

 * A5 (classification), an amputee sport classification
 * A5 grade (climbing)
 * A5, an aid climbing gear manufacturer - absorbed by The North Face
 * A05, Réti 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
 * A5, an Atlanta-based volleyball club

Automobiles

 * Arrows A5, a 1982 British Formula One racing car
 * Audi A5, a 2007–present German compact executive car
 * Chery A5, a 2006–2010 Chinese compact sedan
 * Soueast A5, a 2019–present Chinese compact sedan
 * Sehol A5, a 2019–present Chinese compact sedan, formerly JAC Jiayue A5

Other uses in transportation

 * A5 road, in several countries
 * 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
 * ICON A5, an American amphibious aircraft
 * Pennsylvania Railroad class A5s, an American locomotive
 * Finnish Steam Locomotive Class A5
 * LNER Class A5, a class of 4-6-2T steam locomotives

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 World War I German Focke-Wulf aircraft
 * Sturzkampfgeschwader 1, from its historic Geschwaderkennung code with the Luftwaffe in World War II

Other uses in military

 * 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 uses

 * A5 paper size, an ISO 216 international standard paper size (148 × 210 mm)
 * A5, the highest grade of Japanese wagyu beef
 * In Town and country planning in the United Kingdom, A5 is the code for permission to use specific land or premises for takeaways