# 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
* A$_5$, 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

## Transport
### 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 2018–2023 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

## 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 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