A4 commonly refers to:
*
A4 paper
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 size ...
, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm
A4 and variants may also refer to:
Science and technology
* British NVC community A4 (''Hydrocharis morsus-ranae - Stratiotes aloides'' community), one type of
*
Combretastatin A-4
Combretastatin A-4 is a combretastatin and a stilbenoid. It can be isolated from '' Combretum caffrum'', the Eastern Cape South African bushwillow tree or in '' Combretum leprosum'', the mofumbo, a species found in Brazil.
Function
Tubulin repre ...
, a stilbenoid chemical compound
* ''A''
4, the
alternating group
In mathematics, an alternating group is the group of even permutations of a finite set. The alternating group on a set of elements is called the alternating group of degree , or the alternating group on letters and denoted by or
Basic prop ...
on four elements
* A4, a
type of stainless steel
* Subfamily A4, 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
Computing
*
Apple A4
The Apple A4 is a 32-bit package on package (PoP) system on a chip (SoC) designed by Apple Inc. and manufactured by Samsung. It was the first SoC Apple designed in-house. The first product to feature the A4 was the first-generation iPad, followe ...
, a microprocessor used in some Apple products
*
AMD A4
AMD Accelerated Processing Unit (APU), formerly known as Fusion, is a series of 64-bit microprocessors from Advanced Micro Devices (AMD), combining a general-purpose AMD64 central processing unit ( CPU) and integrated graphics processing unit ...
, a microprocessor
*
Samsung Galaxy A04
The Samsung Galaxy A04 is a series of Android smartphones manufactured by Samsung Electronics. It was announced on August 24, 2022.
Specifications Hardware
The Samsung Galaxy A04 is equipped with a 6.5 in PLS LCD capacitive touchscreen with ...
, a smartphone manufactured by Samsung Electronics
Medicine
*
ATC code A04
A04A Antiemetics and antinauseants A04AA Serotonin (5-HT3) antagonists
:A04AA01 Ondansetron
:A04AA02 Granisetron
:A04AA03 Tropisetron
:A04AA04 Dolasetron
:A04AA05 Palonosetron
:A04AA55 Palonosetron, combinations
A04AD Other antiemetics
:A04AD01 S ...
''Antiemetics and antinauseants'', a subgroup of the Anatomical Therapeutic Chemical Classification System
*
Lipoxin A4
A lipoxin (LX or Lx), an acronym for lipoxygenase interaction product, is a bioactive autacoid metabolite of arachidonic acid made by various cell types. They are categorized as nonclassic eicosanoids and members of the specialized pro-resolving ...
, a lipoxin
*
Androstenedione
Androstenedione, or 4-androstenedione (abbreviated as A4 or Δ4-dione), also known as androst-4-ene-3,17-dione, is an endogenous weak androgen steroid hormone and intermediate in the biosynthesis of estrone and of testosterone from dehydroepia ...
, an androgen steroid hormone
Transportation
Aeronautics and astronautics
* A-4 Helldiver, the civil version of the
Curtiss Falcon
The Curtiss Falcon was a family of military biplane aircraft built by the American aircraft manufacturer Curtiss Aeroplane and Motor Company during the 1920s. Most saw service as part of the United States Army Air Corps as observation aircraft ...
an attack aircraft manufactured by Curtiss Aircraft Company
*
Douglas A-4 Skyhawk
The Douglas A-4 Skyhawk is a single-seat subsonic carrier-capable light attack aircraft developed for the United States Navy and United States Marine Corps in the early 1950s. The delta-winged, single turbojet engined Skyhawk was designed a ...
, a 1954 attack aircraft manufactured by Douglas Aircraft Company
*
Breda A.4
The Breda A.4 was a biplane Trainer (aircraft), trainer produced in Italy in the mid-1920s. It was of conventional configuration with a two-bay Stagger (aviation), unstaggered wing cellule and seating for the pilot and instructor in tandem open c ...
, a 1926 Italian biplane trainer aircraft
* ''
Aggregat-4'', the technical name for V-2 ballistic missile
*
Southern Winds Airlines
Southern Winds Airlines (also known as ''SW Airlines'') was an Argentine commercial air carrier that operated from 1996 until 2005. Southern Winds was founded by Juan Maggio, who served as president of the company.
History
Initially a domestic ...
(IATA code: A4), a defunct Argentine airline
*
Azimuth (airline)
Azimuth (russian: АО «АЗИМУТ», translit=, link=no, branding itself as azimuth) is a Russian joint-stock company airline based in Platov International Airport in Rostov-on-Don, the capital of Rostov Oblast.
History
Due to the merger ...
(IATA code: A4), a Russian airline
*
A-004
A-004 was the sixth and final test of the Apollo launch escape vehicle and the first flight of a Block I production-type Apollo Command/Service Module.
Objectives
Mission A-004 was uncrewed and was conducted to demonstrate that
# The launch e ...
, the sixth and final abort test of the Apollo spacecraft
*
SPAD S.A-4, 1915 French reconnaissance fighter built by SPAD
Railways
*
Bavarian A IV
Bavarian A IV engines were German 2-2-2 steam locomotives with the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn'').
The vehicles were developed for night journeys and operations on the North-South Railway. In order to increa ...
, an 1852 German steam locomotive model
*
LNER Class A4
The Class A4 is a class of streamlined 4-6-2 steam locomotive designed by Nigel Gresley for the London and North Eastern Railway in 1935. Their streamlined design gave them high-speed capability as well as making them instantly recognisable, ...
, a class of steam locomotives, including the famous ''Mallard''
* PRR A4, an American
Pennsylvania Railroad locomotive classification
Locomotive classification on the Pennsylvania Railroad took several forms. Early on, steam locomotives were given single-letter classes. As the 26 letters were quickly assigned, that scheme was abandoned for a more complex system. This was used fo ...
*
Togoshi Station
is a subway station on the Toei Asakusa Line, operated by the Tokyo Metropolitan Bureau of Transportation. It is located in Shinagawa, Tokyo, Japan. Its number is A-04.
Station layout
Togoshi has one platform serving two tracks. Platform 1 is f ...
(station number A-04), Toei Asakusa Line, Tokyo
Ships
*
USS ''A-4'' (SS-5), a ''Plunger''-class submarine of the United States Navy
*
HMNZS ''Kahu'' (A04), a 1978 Royal New Zealand Navy ''Moa''-class inshore patrol vessel
*
HMS ''A4'', an A-class submarine of the Royal Navy
*
Belgian ship ''A4'', a Belgian naval patrol vessel of World War II
Other vehicles
*
Audi A4
The Audi A4 is a line of compact executive cars produced since 1994 by the German car manufacturer Audi, a subsidiary of the Volkswagen Group.
The A4 has been built in five generations and is based on the Volkswagen Group B platform. The first ...
, a luxury compact executive car manufactured by Audi, introduced in 1994
*
Arrows A4
The Arrows A4 was the car which the Arrows Formula One team used to compete in the 1982 Formula One season.
Complete Formula One results
(key
Key or The Key may refer to:
Common meanings
* Key (cryptography), a piece of information that con ...
, a 1982 British racing car
*
Prussian A 4,
a Prussian railbus
Roads and routes
*
List of A4 roads This is a list of roads designated A4.
A4 is the name of several roads:
* A004 road (Argentina), a road connecting Buenos Aires-La Plata highway with the Juan María Gutiérrez circle
* A4 motorway (Austria), a road connecting Vienna and Nickelsd ...
* A4, a
Metrobus route in Washington, D.C., US
Military
* A4, the designation for air force headquarters in the NATO
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 military u ...
concerned with logistics
** A4 Air Logistics, a branch of the
Joint Force Air Component Headquarters
The Joint Force Air Component Headquarters (JFACHQ) is the United Kingdom's deployable air command and control unit. The JFACHQ is run by the Royal Air Force with representation from the other services.
The JFACHQ has members from the operatio ...
in the UK
* A 4, see
List of Swedish regiments
This is a list of Swedish regiments and other military units ( divisions, brigades, battalions, companies) that have existed since the 16th century. Most formations have changed names several times during their existence. Listed here are commonly ...
for A4, a Swedish designation (4th Artillery Regiment) that has been used by:
*
Gotland Artillery Regiment
The Gotland Artillery Regiment ( sv, Gotlands artilleriregemente, designation A 7) was a Swedish Army artillery regiment that was in active service between 1811 and 2000. The regiment was based in Visby as part of the Gotland Garrison.
History
T ...
(designation: A 4), until 1892
*
Norrland Artillery Regiment
The Norrland Artillery Regiment ( sv, Norrlands artilleriregemente), designation A 4, was a Swedish Army artillery regiment that traced its origins back to the 19th century. The regiment's soldiers were originally recruited from the provinces of ...
(designation: A 4), 1893–1997
*
M16A4
The M16 rifle (officially designated Rifle, Caliber 5.56 mm, M16) is a family of military rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-roun ...
, a variant of the American M16 rifle
*
Leopard 1A4
The Leopard 1 (also styled Leopard I, before the Leopard 2 simply known as Leopard) is a main battle tank designed and produced by Porsche in West Germany that first entered service in 1965. Developed in an era when HEAT warheads were thought to ...
, a variant of the German Leopard 1 main battle tank
*
Leopard 2A4
The Leopard 2 is a 3rd generation main battle tank originally developed by Krauss-Maffei in the 1970s for the West German army. The tank first entered service in 1979 and succeeded the earlier Leopard 1 as the main battle tank of the West Germ ...
, a variant of the German Leopard 2 main battle tank
Other uses
*
A4 (classification)
A4 is an Amputee sports classification, amputee sport classification used by the International Sports Organization for the Disabled (ISOD).for people with acquired or congenital amputations. People in this class have one leg amputated below the kn ...
, an amputee sport classification
* A4 or A
4, the musical note
La or A in the fourth octave
*
A440 (pitch standard)
A440 (also known as Stuttgart pitch) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4 in scientific pitch notation. It is standardized by the ...
, the use of the musical note A to reference musical pitch
*
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 kingside ...
(Encyclopaedia of Chess Openings code: A04)
* A4, a climbing route
grade
Grade most commonly refers to:
* Grade (education), a measurement of a student's performance
* Grade, the number of the year a student has reached in a given educational stage
* Grade (slope), the steepness of a slope
Grade or grading may also ref ...
* A4, the code for permission to use specific land or premises for pubs and bars in
town and country planning in the UK
*
A4 pod, a family of killer whales living in British Columbia coastal waters
* A4, a 1981
component for the ''Scourge of the Slave Lord'' adventure in the ''Dungeons and Dragons'' role playing game
*
Biu-Mandara A.4 languages, a family of languages spoken in Cameroon and Nigeria
*
Vlad A4, Belarusian YouTuber
*
A4 Revolution, the 2022 COVID-19 protests in China
See also
*
4A (disambiguation) 4A or IV-A may refer to :
* 4A, Ararat International Airlines' IATA airline designator
* 4A, a series of Toyota A engine produced by Toyota Motor Corporation (1982-2002)
* 4A, the production code for the 1974–75 ''Doctor Who'' serial ''Robot''
* ...
*
A4A (disambiguation) A4A may refer to:
* Adam4Adam, a gay dating service
* Airlines for America
Airlines for America (A4A), formerly known as Air Transport Association of America (ATA), is an American trade association and lobbying group based in Washington, ...
*
AIV (disambiguation)
AIV may refer to:
*Aimco, NYSE symbol AIV, an American operator of apartment communities
*AIV fodder, a kind of acidified silage
*Bavarian A IV, an 1852 German steam locomotive model
*George Downer Airport (IATA: AIV) serving Aliceville, Alabama, ...
{{Letter-Number Combination Disambiguation