E4, E.IV or E-4 may refer to:

Entertainment

E4 (TV channel) E4 is a British free-to-air public broadcast television channel owned and operated by Channel Four Television Corporation. The "E" stands for ''entertainment'' and the channel is primarily aimed at the 16–34 age group (similarly to BBC Thre ...

, a television channel in the United Kingdom and Ireland * ''

Every Extend Extra Extreme ''Every Extend Extra Extreme'' is a game for the Xbox 360's Xbox Live Arcade service released on October 17, 2007. It is an expanded version of the PlayStation Portable game ''Every Extend Extra'' which is, in itself, an expanded version of the 20 ...

'', a video game from Q Entertainment *

Entertainment for All Entertainment is a form of activity that holds the attention and interest of an audience or gives pleasure and delight. It can be an idea or a task, but it is more likely to be one of the activities or events that have developed over thousands ...

, a video game expo

Transportation

* Aero Asia International, an airline, by IATA code

Roads

European route E4 European route E4 passes from north to south through Sweden from the border with Finland, with a total length of . The Finnish part lies entirely within Tornio in northern Finland, and is only long. The Swedish part traverses most of Sweden e ...

, a road through Finland and Sweden *

E4 European long distance path The E4 European long distance path or E4 path is one of the European long-distance paths. Starting at Tarifa Andalusia, located at the southernmost end of the Iberian Peninsula, across the Strait of Gibraltar facing Morocco, it continues through ...

, a European long-distance trail *

Tōhoku Expressway The is a south-north national expressway, and the longest expressway in Japan at . Its southern terminus is in Kawaguchi, Saitama in the Greater Tokyo Area, at the Tokyo Gaikan Expressway and Kawaguchi Route near Araijuku Station, and its no ...

, route E4 in Japan * E4 expressway (Pakistan) *

South Kedah Expressway South Kedah Expressway (Lekas), or Sungai Petani–Kedah Inner Expressway (SPIKE) , is a new expressway under planning in Kedah, Malaysia. "Lekas" stands for "Lebuhraya Kedah Selatan". The South Kedah Expressway is much similar to the North–So ...

in Malaysia * Subic Freeport Expressway in the Philippines

Trains

E4 Series Shinkansen The was a high-speed Shinkansen electric multiple unit train type operated by East Japan Railway Company (JR East) in Japan. They were the second series of completely Bilevel rail car, bi-level Shinkansen trainsets to be built in Japan (the oth ...

, a Japanese high-speed train * CNW Class E-4, a 4-6-4 steam locomotive of the Chicago & Northwestern Railway *

EMC E4 The EMC E4 was a , A1A-A1A passenger train-hauling diesel locomotive built by the Electro-Motive Corporation of La Grange, Illinois. All were built for the Seaboard Air Line Railway. The E4 was the fifth model in a long line of passenger diesel ...

, a diesel locomotive * LB&SCR E4 class, a steam locomotive of the London, Brighton & South Coast Railway * LNER E4 Class, a 2-4-0 steam locomotive built by the Great Eastern Railway and operated by the LNER

Military

Boeing E-4 The Boeing E-4 Advanced Airborne Command Post (AACP), the current "Nightwatch" aircraft, is a series of strategic command and control military aircraft operated by the United States Air Force (USAF). The E-4 series are specially modified from ...

, a U.S. military flying command post * Fokker E.IV, a 1915 German fighter aircraft * E4, the fourth

enlisted rank An enlisted rank (also known as an enlisted grade or enlisted rate) is, in some armed services, any rank below that of a commissioned officer. The term can be inclusive of non-commissioned officers or warrant officers, except in United States ...

in the Military of the United States, including: **

Petty officer third class A Petty officer third class is a non-commissioned officer in some navies and coast guards. By country United States Petty officer third class is the fourth enlisted rank in the United States Navy, U.S. Navy and the United States Coast Guard, ...

in the United States Navy and United States Coast Guard ** Senior airman in the United States Air Force (

Sergeant Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...

until 1976) **

Specialist (rank) Specialist is a military rank in some countries' armed forces. Two branches of the United States Armed Forces use the rank. It is one of the four junior enlisted ranks in the United States Army, above private (PVT), private (PV2), and private ...

in the United States Army (if the soldier is not a non-commissioned officer) **

Corporal Corporal is a military rank in use by the armed forces of many countries. It is also a police rank in some police services. The rank is usually the lowest ranking non-commissioned officer. In some militaries, the rank of corporal nominally corr ...

in the United States Army and United States Marine Corps (if the soldier is a non-commissioned officer)

Science and technology

E4-isoprostane The isoprostanes are prostaglandin-like compounds formed ''in vivo'' from the free radical-catalyzed peroxidation of essential fatty acids (primarily arachidonic acid) without the direct action of cyclooxygenase (COX) enzymes. These nonclassical ...

, a type of isoprostane *

Leukotriene E4 Leukotriene E4 (LTE4) is a cysteinyl leukotriene involved in inflammation. It is known to be produced by several types of white blood cells, including eosinophils, mast cells, tissue macrophages, and basophils, and recently was also found to b ...

, a naturally produced eicosanoid lipid mediator *

E-4 process :''See also Ektachrome for full details of Kodak E-series processes.'' The E-4 process is a now outdated process for developing color reversal (transparency) photographic film, which was introduced in 1966. Drawbacks The process is infamous for ...

, an obsolete development process associated with photographic transparency film *

Honda E4 The E series was a collection of successive humanoid robots created by the Honda Motor Company between the years of 1986 and 1993. These robots were only experimental, but later evolved into the Honda P series, with Honda eventually amassing the k ...

, a predecessor of Honda's ASIMO robot *

RCS-4 RCS-4, or 1-pentyl-3-(4-methoxybenzoyl)indole, is a synthetic cannabinoid drug sold under the names SR-19, BTM-4, or Eric-4 (later shortened to E-4), but originally, OBT-199. Pharmacology RCS-4 is a potent cannabinoid receptor agonist, with EC ...

, a synthetic cannabinoid sold as "E-4" * E4 or E₄, an old name for the exceptional group F₄ *

Estetrol Estetrol (E4), or oestetrol, is one of the four natural estrogenic steroid hormones found in humans, along with estrone (E1), estradiol (E2), and estriol (E3). Estetrol is a major estrogen in the body. In contrast to estrone and estradiol, estet ...

, an estrogen

Other uses

* E4, a postcode district in the

E postcode area The E (Eastern) postcode area, also known as the London E postcode area, is the part of the London post town covering much of east London, England. It borders the N postcode area to the west, both north of the tidal Thames. Since closure of the ...

King's Pawn Game The King's Pawn Game is any chess opening starting with the move: : 1. b:Chess Opening Theory/1. e4, e4 It is the most popular opening move in chess, followed by 1.d4, the Queen's Pawn Game. Principles White opens with the most popular of the ...

, or 1. e4, a chess opening move * E4 grade, a grade of difficulty in rock climbing * E4 or E₄, musical notation indicating the E above

Middle C C or Do is the first note of the C major scale, the third note of the A minor scale (the relative minor of C major), and the fourth note (G, A, B, C) of the Guidonian hand, commonly pitched around 261.63 Hz. The actual frequency has d ...