A9
# A9

A9, A.9, A09, A 9 or A-9 may refer to

## Science

* ATC code A09 Digestives, including enzymes, a subgroup of the Anatomical Therapeutic Chemical Classification System
* Biolimus A9, an immunosuppressant
* British NVC community A9, the Potamogeton natans community, one of the aquatic communities of the British National Vegetation Classification
* HLA-A9, a broad antigen serogroup of Human MHC HLA-A
* Subfamily A9, a Rhodopsin-like receptors subfamily

## Technology

* A9home, a small form factor computer
* A9.com, a website and search engine by Amazon.com
* Apple A9, a 64-bit system on a chip (SoC) designed by Apple Inc.
* Hanlin eReader A9, an ebook reader

## Aviation

* Breda A.9, a 1928 Italian biplane trainer aircraft
* CallAir A-9 Quail, an agricultural aircraft
* Georgian Airways's IATA code
* Lockheed A-9, a ground attack aircraft based on the Lockheed YP-24 fighter prototype
* Northrop YA-9, a ground-attack aircraft that competed with the Fairchild Republic A-10 Thunderbolt II

## Military

* A9, a military staff designation in the continental staff system
* A 9, a Swedish artillery regiment
* A9, a model of German Aggregate Series Rocket from World War II
* Cruiser Mk I (A9), a British tank

## Music

* A9 (band), a Japanese rock band originally named Alice Nine
* A-9, a Gibson mandolin guitar model

## Other uses

* A9 (classification), an amputee sport classification
* A9 road, in several countries, see List of A9 roads
* A9, an international ISO 216 paper size standard (37×52 mm)
* A-9 Vigilance, a fictional starfighter from the Star Wars universe
* Arrows A9, a 1986 British racing car
* HMNZS Manawanui (A09), a 1988 diving support vessel for the Royal New Zealand Navy
* HMS A9, an A-class submarine of the Royal Navy
* Réti Opening or A09, a chess opening
* A9 TV, a Turkish television station
