E is the fifth letter of the Latin alphabet. E or e may also refer to:

Computing and computation

E (1970s text editor) E is a text editor originally developed at the Stanford AI Lab in the 1970s for the WAITS operating system. E was one of the first WYSIWYG editors. Richard Stallman visited the Stanford Artificial Intelligence Lab in 1976 and was quite impressed ...

, a text editor developed at the Stanford AI Lab in the 1970s *

E (complexity) In computational complexity theory, the complexity class E is the set of decision problem In computability theory and computational complexity theory, a decision problem is a computational problem that can be posed as a yes–no question on a ...

, a set of decision problems solvable by a Turing machine in a specific time * /e/ (operating system), a fork of LineageOS, which in turn is based on Android * E (PC DOS), a text editor * E (programming language), an object-oriented programming language *

E (theorem prover) E is a high-performance theorem prover for full first-order logic with equality. It is based on the equational superposition calculus and uses a purely equational paradigm. It has been integrated into other theorem provers and it has been among t ...

, a modern, high performance prover for first-order logic *

e (verification language) e is a hardware verification language (HVL) which is tailored to implementing highly flexible and reusable verification testbenches. History ''e'' was first developed in 1992 in Israel by Yoav Hollander for his Specman software. In 1995 h ...

hardware verification language *

Amiga E Amiga E is a programming language created by Wouter van Oortmerssen on the Amiga computer. The work on the language started in 1991 and was first released in 1993. The original incarnation of Amiga E was being developed until 1997, when the pop ...

, a programming language * E or

Enlightenment (software) Enlightenment, also known simply as E, is a compositing window manager for the X Window System The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X originated as part of ...

, a free software open source manager for X Window System

Commerce and transportation

* €, the symbol for the

euro The euro (currency symbol, symbol: euro sign, €; ISO 4217, currency code: EUR) is the official currency of 20 of the Member state of the European Union, member states of the European Union. This group of states is officially known as the ...

, the European Union's standard currency unit * ℮, the

estimated sign The estimated sign or estimated symbol, , (officially, the ℮-mark or the final EC verification mark in EU law,) can be found on most prepackaged products in the European Union (EU). Its use indicates that the prepackage fulfils EU Directive 76 ...

, an EU symbol indicating that the weight or volume of pre-packaged goods is within specific allowable tolerances * E, the country identifier for

vehicle registration plates of Spain Vehicle registration plates are the mandatory number plates used to display the registration mark of a vehicle, and have existed in Spain since 1900. Most motor vehicles which are used on public roads are required by law to display them. The gov ...

* E, a Polish electric locomotive in

PKP classification system PKP classification system (Polish locomotive designation) is a system of assigning letters and numbers to series and individual locomotives used by the PKP - Polish national railroad operator. The system was introduced for the steam stock by th ...

* E or

Eni Eni is an Italian oil and gas corporation. Eni or ENI may refer to: Businesses and organisations * Escuela Nacional de Inteligencia, the Argentine intelligence academy * Groupe des écoles nationales d’ingénieurs (Groupe ENI), a French engi ...

, an Italian oil and gas company * E-Mark, an approval mark for automotive products in Europe under the

World Forum for Harmonization of Vehicle Regulations The World Forum for Harmonization of Vehicle Regulations is a working party (WP.29) of the Inland Transport Committee (ITC) of the United Nations Economic Commission for Europe (UNECE). Its responsibility is to manage the multilateral Agreements ...

Mini E The Mini E was a demonstration electric car developed by BMW i as a conversion of its Mini Cooper car. The Mini E was developed for field trials and deployed in several countries, including the United States, Germany, UK, France, Japan and Chin ...

, an electric hatchback built as a demonstration car * Honda e, an electric hatchback * E (Los Angeles Railway) *

E (New York City Subway service) The E Queens Boulevard Express/Eighth Avenue Local is a rapid transit service in the B Division (New York City Subway), B Division of the New York City Subway. Its route emblem, or "bullet", is blue since it uses the IND Eighth Avenue Line in M ...

, a subway service in New York *

E Line (Los Angeles Metro) The E Line (formerly the Expo Line from 2012–2019) is a light rail line in Los Angeles County, California. It is one of the six lines of the Los Angeles Metro Rail system, operated by the Los Angeles County Metropolitan Transportation Author ...

Line E (Buenos Aires Underground) Line E of the Buenos Aires Underground runs from Retiro to Plaza de los Virreyes, a total distance of 12 km. Opened in 1944, the Line E was the last completely new line to be added to the Buenos Aires Underground, until 2007 when Line H ...

of the Buenos Aires Subte *

RER E RER E is one of the five lines in the Réseau Express Régional (English: Regional Express Network), a hybrid commuter rail and rapid transit system serving Paris and its suburbs. The line travels between western and eastern suburbs, with all ...

, a line in the RER of Paris *

Toei Ōedo Line The is a rapid transit railway line of the municipal Toei Subway network in Tokyo, Japan. It commenced full operations on December 12, 2000; using the Japanese calendar this reads "12/12/12" as the year 2000 equals Heisei 12. The line is comple ...

, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled Toei Oedo line symbol

* The official West Japan Railway Company service symbol for: ** JRW kinki-E

San'in Main Line The is a railway line in western Japan, which connects Kyoto and Shimonoseki, Yamaguchi, operated by West Japan Railway Company (JR West). It is the major railway line of the San'in region, approximately paralleling the Japan Sea, crossing Kyot ...

. **

Kisuki Line The is a railway line in Japan operated by West Japan Railway Company (JR West). The line connects in Matsue, Shimane with in Shōbara, Hiroshima. Stations 　Four〜10 Diesel trains are operated every day. There are more trains between Shi ...

Geography

* E or

east East is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fact that ea ...

, one of the four cardinal directions *

E (state) The state of E (IPA:/ ɤ̂/), whose Middle and Old Chinese name has been reconstructed as Ngak (IPA:/ŋˤak/), was an ancient Chinese state in the area of present-day Henan and Hubei in China from around the 12th century BCE until its overthr ...

, a vassal state in Zhou Dynasty China (1046–256 BC) *

E Township, Maine E is an unincorporated township located in Aroostook County, Maine, United States. It is part of the Central Aroostook Unorganized Territory and borders the towns of Blaine to the east and Westfield to the north. As of the 1990 census A cen ...

, an unincorporated community in USA *

Mount E is an active stratovolcano of the Kameda peninsula, which is itself part of the larger Oshima Peninsula. It is in the rural, eastern region of Hakodate, Hokkaido, Japan. Mount E is part of Esan Prefectural Natural Park. Geology Mount E co ...

(), a stratovolcano on Oshima Peninsula, Japan * River E, a river in Scotland *

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 ...

, for east London * E,

New Brunswick New Brunswick is a Provinces and Territories of Canada, province of Canada, bordering Quebec to the north, Nova Scotia to the east, the Gulf of Saint Lawrence to the northeast, the Bay of Fundy to the southeast, and the U.S. state of Maine to ...

's postal code *

Hubei Hubei is a province of China, province in Central China. It has the List of Chinese provincial-level divisions by GDP, seventh-largest economy among Chinese provinces, the second-largest within Central China, and the third-largest among inland ...

, abbreviated in Chinese as È (鄂), a province of China

Languages

É (temple) É (Cuneiform: ) is the Sumerian word or symbol for house or temple. The Sumerian term É.GAL (𒂍𒃲,"palace", literally "big house") denoted a city's main building. É.LUGAL (𒂍𒈗,"king's house") was used synonymously. In the texts o ...

, Sumerian word for house or temple *

E language E (), also known as Ei, Wuse, or Wusehua, ( zh, t=五色話, s=五色话, p=Wǔsèhuà, l=colored language) is a Tai– Chinese mixed language spoken primarily in Rongshui Miao Autonomous County, Guangxi, China. It contains features of both T ...

, a language of China * E, the

Spivak pronoun The Spivak pronouns 'e/em/eir' are a set of gender-neutral pronouns in English promoted on the virtual community ''LambdaMOO'' based on pronouns used in a book by American mathematician Michael Spivak. Though not in widespread use, they have ...

meaning "he" or "she"

Letters and other characters

* Ⓔ or ⓔ or (e) or (E) - circled-E or circled-E, see

Enclosed Alphanumerics Enclosed Alphanumerics is a Unicode block of Typography, typographical symbols of an alphanumeric within a circle, a bracket or other not-closed enclosure, or ending in a full stop. It is currently fully allocated. Within the Basic Multi ...

* Latin E with diacritic: ** É or é - ''e-acute'', an accented letter of many Latin alphabets. ** È or è - ''e-grave'', another accented letter of many Latin alphabets ** Ê or ê - ''e with circumflex'' ** Ë or ë - ''e with trema'' (diaeresis or umlaut) ** Ē or ē - ''e with macron'' * e, the

close-mid front unrounded vowel The close-mid front unrounded vowel, or high-mid front unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabeti ...

IPA symbol *Tifinagh letter ⴹ * Е and е, a letter of the Cyrillic alphabet * Ε and ε, the letter epsilon in the Greek alphabet

Mathematics and logic

* (mathematical constant), a mathematical constant also known as Euler's number and Napier's constant *

E notation Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form, since to do so would require writing out an inconveniently long string of digits. It may be referred to as scienti ...

, or scientific notation, a way of writing very large and very small numbers such as 5E7 * ∃ (a backwards E; U+2203) or

existential quantification Existentialism is a family of philosophy, philosophical views and inquiry that explore the human individual's struggle to lead an Authenticity (philosophy), authentic life despite the apparent Absurdity#The Absurd, absurdity or incomprehensibili ...

, the symbol for "there exists...", in predicate logic * ∃!, meaning "there exists only one" (or "there exists exactly one"), see

Uniqueness quantification In mathematics and logic, the term "uniqueness" refers to the property of being the one and only object satisfying a certain condition. This sort of quantification is known as uniqueness quantification or unique existential quantification, and i ...

* E, 14 in

hexadecimal Hexadecimal (also known as base-16 or simply hex) is a Numeral system#Positional systems in detail, positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbo ...

and other positional numeral systems of a base of 15 or higher *

\operatorname /math> or

expected value In probability theory, the expected value (also called expectation, expectancy, expectation operator, mathematical expectation, mean, expectation value, or first Moment (mathematics), moment) is a generalization of the weighted average. Informa ...

, the average expected outcome of a trial in probability theory * , the complete elliptic integral of the second kind * , the

identity element In mathematics, an identity element or neutral element of a binary operation is an element that leaves unchanged every element when the operation is applied. For example, 0 is an identity element of the addition of real numbers. This concept is use ...

* , the

Erdős–Borwein constant The Erdős–Borwein constant, named after Paul Erdős and Peter Borwein, is the sum of the reciprocals of the Mersenne numbers. By definition it is: :E=\sum_^\frac\approx1.606695152415291763\dots Equivalent forms It can be proven that the fol ...

* ∈, notation indicating that an object is a member or element of a set: see

Element (mathematics) In mathematics Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. ...

Medicine and genetics

E number E numbers, short for Europe numbers, are codes for substances used as food additives, including those found naturally in many foods, such as vitamin C, for use within the European Union (EU) and European Free Trade Association (EFTA). Commonly ...

, a number code for a food additive, an EU labelling requirement *

Haplogroup E (mtDNA) In human mitochondrial genetics, haplogroup E is a Human mitochondrial DNA haplogroups, human mitochondrial DNA (mtDNA) haplogroup typical for the Malay Archipelago. It is a subgroup of Haplogroup M (mtDNA), haplogroup M9. Origin Two contrasti ...

, a human mitochondrial DNA (mtDNA) haplogroup *

Haplogroup E (Y-DNA) Haplogroup E-M96 is a human Y-chromosome DNA haplogroup. It is one of the two main branches of the older and ancestral haplogroup DE, the other main branch being haplogroup D. The E-M96 clade is divided into two main subclades: the more commo ...

, a Y-chromosomal DNA (Y-DNA) haplogroup * E (or Glu), an abbreviation for

glutamic acid Glutamic acid (symbol Glu or E; known as glutamate in its anionic form) is an α- amino acid that is used by almost all living beings in the biosynthesis of proteins. It is a non-essential nutrient for humans, meaning that the human body can ...

or glutamate * Vitamin E or

Tocopherol Tocopherols (; TCP) are a class of organic compounds comprising various methylated phenols, many of which have vitamin E activity. Because the vitamin activity was first identified in 1936 from a dietary fertility factor in rats, it was named ''t ...

, a class of chemical compounds * The symbol for the hormone

epinephrine Adrenaline, also known as epinephrine, is a hormone and medication which is involved in regulating visceral functions (e.g., respiration). It appears as a white microcrystalline granule. Adrenaline is normally produced by the adrenal glands a ...

* E, a common abbreviation for 'Ecstasy' (a familiar name for the psychoactive recreational drug

MDMA 3,4-Methylenedioxymethamphetamine (MDMA), commonly known as ecstasy (tablet form), and molly (crystal form), is an empathogen–entactogenic drug with stimulant and minor Psychedelic drug, psychedelic properties. In studies, it has been used ...

) *

Ethambutol Ethambutol (EMB, E) is a medication primarily used to treat tuberculosis. It is usually given in combination with other tuberculosis medications, such as isoniazid, rifampicin and pyrazinamide. It may also be used to treat ''Mycobacterium avi ...

Estrogen (medication) An estrogen (E) is a type of medication which is used most commonly in hormonal birth control and menopausal hormone therapy, and as part of feminizing hormone therapy for transgender women. They can also be used in the treatment of horm ...

Estradiol (medication) Estradiol (E2) is a medication and naturally occurring steroid hormone. It is an estrogen and is used mainly in menopausal hormone therapy and to treat hypogonadism, low sex hormone levels in women. It is also used in hormonal contraception, ...

Music

E (musical note) E is the third Musical note, note and the fifth semitone of the C major scale, and mi in Solfège#Fixed do solfège, fixed-do solfège. It has enharmonic equivalents of F♭ F-flat) which is by definition a diatonic semitone above Eand D (D- ...

E major E major is a major scale based on E, consisting of the pitches E, F, G, A, B, C, and D. Its key signature has four sharps. Its relative minor is C-sharp minor and its parallel minor is E minor. Its enharmonic equivalent, F-flat maj ...

, a scale *

E minor E minor is a minor scale based on E, consisting of the pitches E, F, G, A, B, C, and D. Its key signature has one sharp, on the F. Its relative major is G major and its parallel major is E major. The E natural minor scale is: Change ...

, a scale * E major chord, see

Chord names and symbols (popular music) Musicians use various kinds of chord names and symbols in different contexts to represent musical chords. In most genres of popular music, including jazz, pop, and rock, a chord name and its corresponding symbol typically indicate one or mo ...

* ''E'' (video), by Eminem * ''E'' (Adrian Belew album), 2009 * ''É'' (album), by Duda Brack, 2015 * ''E'' (Ecco2K album), 2019 * ''E'' (Enslaved album), 2017 * ''E'' (Epik High album), 2009 * ''E'' (single album), by Big Bang, 2015 * "E", a song by Baboon from ''

Sausage A sausage is a type of meat product usually made from ground meat—often pork, beef, or poultry—along with salt, spices and other flavourings. Other ingredients, such as grains or breadcrumbs, may be included as fillers or extenders. ...

'', 1992

People

* E (surname) (), Chinese surname * E, a nickname of

Mark Oliver Everett Mark Oliver Everett, also known by his stage name E (born April 10, 1963) is an American singer, songwriter, multi-instrumentalist and the frontman of the rock band Eels (band), Eels. He is known for writing songs tackling subjects such as dea ...

, musician and front man of the rock band Eels * e, a nickname of Eric Neustadter, Former Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast *

Mr. E (disambiguation) Mr. E is a name that has been used by several people and fictional characters over the years. In most cases, it is a pun based on the name being homophonous with the word ''mystery''. Mr. E may refer to: * Mister E, a DC Comics character and me ...

Physics and engineering

* e (or e⁻) or

electron The electron (, or in nuclear reactions) is a subatomic particle with a negative one elementary charge, elementary electric charge. It is a fundamental particle that comprises the ordinary matter that makes up the universe, along with up qua ...

, a fundamental subatomic particle * e or

elementary charge The elementary charge, usually denoted by , is a fundamental physical constant, defined as the electric charge carried by a single proton (+1 ''e'') or, equivalently, the magnitude of the negative electric charge carried by a single electron, ...

, the absolute value of the electric charge carried by a single electron. * e or

coefficient of restitution In physics, the coefficient of restitution (COR, also denoted by ''e''), can be thought of as a measure of the elasticity of a collision between two bodies. It is a dimensionless parameter defined as the ratio of the relative velocity of sepa ...

(COR), a measure of the elasticity of a collision in mechanics * E, the symbol for energy in equations concerning

mass–energy equivalence In physics, mass–energy equivalence is the relationship between mass and energy in a system's rest frame. The two differ only by a multiplicative constant and the units of measurement. The principle is described by the physicist Albert Einstei ...

* E or

Young's modulus Young's modulus (or the Young modulus) is a mechanical property of solid materials that measures the tensile or compressive stiffness when the force is applied lengthwise. It is the modulus of elasticity for tension or axial compression. Youn ...

, a measure of stiffness in solid mechanics * E or

exa- A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The pre ...

, the SI prefix for 10¹⁸ * E-layer or the Kennelly-Heaviside layer, part of the ionosphere * E, the symbol for an

electric field An electric field (sometimes called E-field) is a field (physics), physical field that surrounds electrically charged particles such as electrons. In classical electromagnetism, the electric field of a single charge (or group of charges) descri ...

* e or

orbital eccentricity In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values be ...

, a measure of how much a conic section deviates from a circle * E or Equal Energy spectrum, a definition of

white White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...

in colour printing * E, the

electrode potential An electrode is an electrical conductor used to make contact with a nonmetallic part of a Electronic circuit, circuit (e.g. a semiconductor, an electrolyte, a vacuum or a gas). In electrochemical cells, electrodes are essential parts that can c ...

, the electromotive force of a cell built of two electrodes ** E° or

E^\ominus

, the

standard electrode potential In electrochemistry, standard electrode potential E^\ominus, or E^\ominus_, is the electrode potential (a measure of the reducing power of any element or compound) which the IUPAC "Gold Book" defines as ''"the value of the standard emf ( electrom ...

Television and film

* E!, Entertainment Television, an American cable and satellite TV network **

E! (Australia and New Zealand) E! was an Australian and New Zealand pay television channel, owned by NBCUniversal International Networks. Much like its American counterpart it featured entertainment-related programming, reality television and Hollywood news. It was available, ...

, the defunct Australian and New Zealand version of American E! * E! (Canada): **

E! (Canadian TV system) The first incarnation of E!, also referred to as E! Entertainment Television, was a Canadian English language privately owned television system that existed from 2001 to 2009 under the ownership of Canwest. At its peak it consisted of eight loc ...

, a defunct over-the-air television system operated by Canwest from 2001 to 2009 (originally known as CH until 2007) **

E! (Canadian TV channel) E! Entertainment Television is an American basic cable television network. It is owned by the NBCUniversal Media Group division of Comcast's NBCUniversal. The channel focuses primarily on pop culture, celebrity based reality shows and movies. ...

, a Canadian cable/satellite specialty channel owned by Bell Media that launched in November 2010. * ''E'' (2006 film), a 2006 Tamil film * ''E'' (2017 film) * E, an alias of Edna Mode, a character from the movie ''The Incredibles'' * E, an alias of Eric Murphy (''Entourage''), a character from the television series ''Entourage'' * E, the production code for the 1964 ''Doctor Who'' serial ''

The Keys of Marinus ''The Keys of Marinus'' is the fifth serial in the British science fiction television series ''Doctor Who'', which was first broadcast on BBC TV/BBC1 in six weekly parts from 11 April to 16 May 1964. Written by Terry Nation and directed by Joh ...

'' * E (Exempt), an unofficial category in the

British Board of Film Classification The British Board of Film Classification (BBFC) is a non-governmental organization, non-governmental organisation founded by the British film industry in 1912 and responsible for the national classification and censorship of films exhibited ...

rating system

Other uses

* ''e'' (novel), a 2000 comic novel by Matt Beaumont * E band (disambiguation) * E#, a team's elimination number * E, or the

Elohist According to the documentary hypothesis, the Elohist (or simply E) is one of four source documents underlying the Torah, together with the Jahwist (or Yahwist), the Deuteronomist and the Priestly source. The Elohist is so named because of its ...

, one of the four sources of the Torah * E, or Everyone, a video game rating symbol used by the

Entertainment Software Rating Board The Entertainment Software Rating Board (ESRB) is a self-regulatory organization that assigns age and content ratings to consumer video games in Canada, the United States, and Mexico. The ESRB was established in 1994 by the Entertainment Soft ...

which is suitable for all ages. * Dominical letter E for a

common year starting on Wednesday A common year starting on Wednesday is any non-leap year (a year with 365 days) that begins on Wednesday, January 1, and ends on Wednesday, December 31. Its dominical letter hence is E. The current year, 2025, is a common year starting on Wedne ...

* E-Z notation, to indicate double bonds that two groups of higher priority are on opposite sides. * E or EDGE, for

Enhanced Data Rates for GSM Evolution Enhanced Data rates for GSM Evolution (EDGE), also known as 2.75G and under various other names, is a 2G digital mobile phone technology for packet switched data transmission. It is a subset of General Packet Radio Service (GPRS) on the G ...

* E, the symbol of the

Eredivisie The Eredivisie (; "Honour Division" or "Premier Division") is a professional association football league in the Netherlands and the highest level of the Dutch football league system. The league was founded in 1956, two years after the start o ...

logo

Computing and computation

Commerce and transportation

Geography

Languages

Letters and other characters

Mathematics and logic

Medicine and genetics

Music

People

Physics and engineering

Television and film

Other uses

See also