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
• 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

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

Other

• A9 road, in several countries
• A-9, a Gibson mandolin guitar model
• A9, an international ISO 216 paper size standard (37×52 mm)
• A-9 Vigilance, a fictional starfighter from the Star Wars universe
• Alice Nine or A9, a Japanese rock band
• 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

See also

• Grumman Gooseor Grumman OA-9, "Goose" amphibious aircraft in USAAC service
• Northrop YA-9, a prototype attack aircraft developed for the United States Air Force