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 Rhodopsin-like receptors are a family of proteins that comprise the largest group of G protein-coupled receptors. Scope G-protein-coupled receptors, GPCRs, constitute a vast protein family that encompasses a wide range of functions (including ...

subfamily

Technology

A9home The A9home was a niche small-form-factor desktop computer running RISC OS Adjust32. It was officially unveiled at the 2005 Wakefield Show, and is the second commercial ARM-based RISC OS computer to run a 32-bit version of RISC OS. When the Iyonix ...

, a small form factor computer *

A9.com A9.com is a former subsidiary of Amazon that develops search engine and search advertising technology. A9 is based in Palo Alto, California, with teams in Seattle, Bangalore, Beijing, Dublin, Iași, Munich and Tokyo. A9 has development efforts i ...

, a website and search engine by Amazon.com *

Apple A9 The Apple A9 is a 64-bit ARM-based system-on-chip (SoC), designed by Apple Inc. Manufactured for Apple by both TSMC and Samsung, it first appeared in the iPhone 6S and 6S Plus which were introduced on September 9, 2015. Apple states that it h ...

, a 64-bit system on a chip (SoC) designed by Apple Inc. * Hanlin eReader A9, an ebook reader

Aviation

Breda A.9 The Breda A.9 was a biplane trainer produced in Italy in 1928 for the ''Regia Aeronautica''. Conventional in design, it featured a single-bay, unstaggered wing cellule and fixed tailskid undercarriage. The student and instructor sat in tande ...

, a 1928 Italian biplane trainer aircraft *

CallAir A-9 : ''For the USAF unmanned Quail drone aircraft, see ADM-20 Quail.'' The IMCO CallAir A-9 is a small agricultural aircraft that first flew in 1962, a development of the company's previous successful crop-dusters. It is typical of aircraft of it ...

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 The Northrop YA-9 was a prototype attack aircraft developed for the United States Air Force A-X program. The YA-9 was passed over in preference for the Fairchild Republic YA-10 that entered production as the A-10 Thunderbolt II. Design and d ...

, 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 military staff or general staff (also referred to as army staff, navy staff, or air staff within the individual services) is a group of officers, enlisted and civilian staff who serve the commander of a division or other large militar ...

* A 9, a Swedish artillery regiment * A9, a model of German Aggregate Series Rocket from World War II *

Cruiser Mk I (A9) The Tank, Cruiser, Mk I (A9) was a British cruiser tank of the interwar period. It was the first cruiser tank: a fast tank designed to bypass the main enemy lines and engage the enemy's lines of communication, as well as enemy tanks. The Cruiser ...

, 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 ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper si ...

paper size standard (37×52 mm) *

A-9 Vigilance ''Dark Empire'' is a ''Star Wars'' comic book metaseries produced by Dark Horse Comics. It consists of a six-issue limited series written by Tom Veitch and drawn by Cam Kennedy, followed by a second six-issue limited series by Veitch and Kennedy, ...

, a fictional starfighter from the Star Wars universe * Arrows A9, a 1986 British racing car * , a 1988 diving support vessel for the Royal New Zealand Navy * HMS ''A9'', an A-class submarine of the Royal Navy *

Réti Opening The Réti Opening is a hypermodern chess opening whose "traditional" or "classic method" begins with the moves: :1. Nf3 d5 :2. c4 White attacks Black's pawn from the , which may occasion 2...dxc4. White may couple this plan with a kingsid ...