A4 most often refers to:
*
A4 paper, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm
A4 and variants may also refer to:
Science and mathematics
* 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 on four elements
* A4, a
type of stainless steel, as defined by ISO 3506, equivalent to SAE steel grade 316L
* 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
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
*
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 an attack aircraft manufactured by Curtiss Aircraft Company
*
Douglas A-4 Skyhawk, 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
* A4,
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 ...
, the defunct Argentine airline, as its IATA code
* A4,
Azimuth (airline), as its current IATA code
*
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
*
S.A-4 or 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 ...
, number A-04 on the Toei Asakusa Line
Ships
* ''A-4'', , a ''Plunger''-class submarine of the United States Navy, which was renamed ''A-4'' on 17 November 1911
* , a 1978 Royal New Zealand Navy ''Moa''-class inshore patrol vessel
* , an A-class submarine of the Royal Navy
* , a Belgian naval patrol vessel of World War II
Other vehicles
*
Audi A4, 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 1913 German
railbus
A railbus is a lightweight passenger railcar that shares many aspects of its construction with a bus, typically having a bus (original or modified) body and four wheels on a fixed base, instead of on bogies. Originally designed and developed ...
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.
Military
* A4, the model number of the World War II-era German
V-2
The V-2 (german: Vergeltungswaffe 2, lit=Retaliation Weapon 2), with the technical name ''Aggregat 4'' (A-4), was the world’s first long-range guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was developed ...
rocket
* 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
** In the United Kingdom, the A4 Air Logistics branch of the
Joint Force Air Component Headquarters
* 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:
**
Gotlands artilleriregemente
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 ...
(unknown–1892)
**
Norrlands artilleriregemente
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 ...
(1893–1997)
*
Douglas A-4 Skyhawk, an American attack aircraft introduced in 1956
*
M16A4, 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
Computing
*
Apple A4, 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
Other uses
*
A4 (classification), 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
* A04, Encyclopaedia of Chess Openings code for
Réti Opening
* A4, a
grade (climbing)
In rock climbing, mountaineering, and other climbing disciplines, climbers give a grade to a climbing route or boulder problem, intended to describe concisely the difficulty and danger of climbing it. Different types of climbing (such as sport ...
* 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
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)
*
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