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

Commerce and transportation

* €, the symbol for the euro, the European Union's standard currency unit * ℮, the estimated sign, 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 the ...

* E or

Eni Eni S.p.A. () is an Italian multinational energy company headquartered in Rome. Considered one of the seven "supermajor" oil companies in the world, it has operations in 69 countries with a market capitalization of US$54.08 billion, as of 11 Ap ...

, 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 *

E (Los Angeles Railway) E refers to two streetcar routes in Los Angeles, California which were operated by the Los Angeles Railway. The first incarnation was in service from 1920 to 1932 when it was redesignated as route 5. The second existed between 1920 and 1946, tho ...

E (New York City Subway service) The E Eighth Avenue Local is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is blue since it uses the IND Eighth Avenue Line in Manhattan. The E operates at all times between Jamaica Cen ...

, a Subway service in New York * E Line (Los Angeles Metro) * Line E of the Buenos Aires Subte

Medicine and genetics

E number E numbers ("E" stands for "Europe") 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), a human mitochondrial DNA (mtDNA) haplogroup * Haplogroup E (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup * E or

glutamic acid Glutamic acid (symbol Glu or E; the ionic form is known as glutamate) 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 synt ...

, an amino acid, glutamate * ''E. coli'' or '' Escherichia coli'', a bacterium commonly found in the lower intestine; some are pathogenic, others are not * ''E. coli'' or ''

Entamoeba coli ''Entamoeba coli'' is a non-pathogenic species of ''Entamoeba'' that frequently exists as a commensal parasite in the human gastrointestinal tract. ''E. coli'' (not to be confused with the bacterium ''Escherichia coli'') is important in medicine ...

'', a non-pathogenic parasite frequently found in the human intestine * Vitamin E or Tocopherol, 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 and ...

* E, a common abbreviation for 'Ecstasy' (a familiar name for the psychoactive recreational drug MDMA) * Ethambutol * Estradiol (medication), particularly in transgender contexts

Physics and engineering

* e (or e⁻) or electron, a fundamental subatomic particle * e or

elementary charge The elementary charge, usually denoted by is the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 . This elementary charge is a fundame ...

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

coefficient of restitution The coefficient of restitution (COR, also denoted by ''e''), is the ratio of the final to initial relative speed between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision. A perfectl ...

(COR), a measure of the elasticity of a collision in mechanics * E, the symbol for energy in equations concerning mass-energy equivalence * E or Young's modulus, 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 E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field fo ...

* 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 betwee ...

, a measure of how much a conic section deviates from a circle * E or Equal Energy spectrum, a definition of white in colour printing * E, the electrode potential, the electromotive force of a cell built of two electrodes ** E° or

E^\ominus

, the standard electrode potential

Mathematics and logic

* , the mathematical constant also known as Euler's number and Napier's constant, a transcendental number and the base of natural logarithms, approximately equal to 2.718 *

E notation Scientific notation is a way of expressing numbers that are too large or too small (usually would result in a long string of digits) to be conveniently written in decimal form. It may be referred to as scientific form or standard index form, o ...

, or scientific notation, a way of writing very large and very small numbers such as 5E7 * ∃ (a backwards E; U+2203) or existential quantification, the symbol for "there exists...", in predicate logic; ∃! meaning "there exists only one" (or "there exists exactly one") - see Uniqueness quantification * E, 14 in

hexadecimal In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of 16. Unlike the decimal system representing numbers using 10 symbols, hexa ...

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, mathematical expectation, mean, average, or first moment) is a generalization of the weighted average. Informally, the expected value is the arithmetic mean of a l ...

, the average expected outcome of a trial in probability theory * , the

complete elliptic integral of the second kind In integral calculus, an elliptic integral is one of a number of related functions defined as the value of certain integrals, which were first studied by Giulio Fagnano and Leonhard Euler (). Their name originates from their originally arising i ...

* , the identity element * , the

Erdős–Borwein_constant The Erdős–Borwein constant is the sum of the Reciprocal (mathematics), reciprocals of the Mersenne prime, Mersenne numbers. It is named after Paul Erdős and Peter Borwein. By definition it is: :E=\sum_^\frac\approx1.606695152415291763\dots Eq ...

Computing and computation

* E (complexity), a set of decision problems solvable by a Turing machine in a specific time *

E (PC DOS) E is the text editor which was made part of PC DOS with version 6.1 in June 1993, in February 1995 with version 7 and later with PC DOS 2000. In version 6.1, IBM dropped QBASIC, which, in its edit mode, was also the system text editor. It was nec ...

, a text editor *

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 (programming language) E is an object-oriented programming language for secure distributed computing, created by Mark S. Miller, Dan Bornstein, Douglas Crockford, Chip Morningstar and others at Electric Communities in 1997. E is mainly descended from the concurrent ...

, an object-oriented programming language *

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 * E (theorem prover), a modern, high performance prover for first-order logic * Amiga E, a programming language * E or Enlightenment (software), a free software open source manager for X Window System *

/e/ (operating system) /e/ (also known as /e/ OS and /e/OS, formerly Eelo) is a fork of LineageOS, an Android-based mobile operating system, and associated online services. /e/ is presented as privacy software that does not contain proprietary Google apps or service ...

, a fork of LineageOS, which in turn is based on Android

Music

* E (musical note) *

E major E major (or the key of E) 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, ...

, a scale * E minor, a scale * E major chord, Chord names and symbols (popular music) * E, a nickname of

Mark Oliver Everett Mark Oliver Everett (born April 10, 1963) is the American lead singer, songwriter, guitarist, keyboardist and sometimes drummer of the rock band Eels. Also known as E, he is known for writing songs tackling subjects such as death, loneliness, d ...

, musician and front man of the rock band Eels * ''E'' (video), by Eminem * ''E'' (Adrian Belew album), 2009 * ''É'' (album), by Duda Brack, 2015 * ''E'' (Enslaved album), 2017 * ''E'' (Epik High album), 2009 * ''E'' (single album), by Big Bang, 2015 * ''E'', a 2019 album by Ecco2K * "E", a song by Baboon from '' Sausage'', 1992

Television and film

* E!, Entertainment Television, an American cable and satellite TV network ** E! (Australia), the Australian version of American E! * E! (Canada): ** E! (Canadian TV system), a defunct over-the-air television system operated by Canwest from 2001 to 2009 (originally known as CH until 2007) ** E! (Canadian TV channel), 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, or Edna Mode, a character from the movie ''The Incredibles'' * E, or

Eric Murphy Eric "E" Murphy is a fictional character on the comedy-drama television series ''Entourage'', and is played by Kevin Connolly. Fictional character biography Eric, Vince Chase's best friend since they were six, works as Vince's manager. Vince ...

, 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 ...

Geography

* E or east, one of the four cardinal directions *

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, when it w ...

, an unincorporated community in USA *

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 overthrow i ...

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

River E The River E is a river in the Highlands of Scotland. It begins in the north-west of the Monadh Liath, to the south-east of Loch Ness. It runs in a north-westerly direction for about 10 km, before flowing into Loch Mhòr. The river has a smal ...

, a river in Scotland * Mount E ( ja, 恵山, E-san, Mount Wisdom), Kameda, Oshima, Hakodate, Hokkaido, Japan; a stratovolcano * E postcode area, for east London * E, New Brunswick's postal code * Hubei, abbreviated in Chinese as È (鄂), a province of China

Languages

* E language, a language of China * É (temple), Sumerian house or temple * E, the Spivak pronoun meaning "he" or "she"

Letters and other characters

* Ⓔ or ⓔ or (e) or (E) - circled-E or circled-E, see Enclosed Alphanumerics * 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 IPA symbol * Е and е, a letter of the Cyrillic alphabet * Ε and ε, the letter

Epsilon Epsilon (, ; uppercase , lowercase or lunate ; el, έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a mid front unrounded vowel or . In the system of Greek numerals it also has the value five. It was der ...

in the Greek alphabet

People

* E (surname) (), Chinese surname * e, a nickname of Eric Neustadter, Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast *

Mr. E (disambiguation) Mr. E may refer to: * Mister E, a DC Comics character and member of The Trenchcoat Brigade * Mister E (Timely Comics), a Timely Comics (now Marvel Comics) character * Mr. E, a villain in the TV series ''Ninjago'' * Mr. E, a character in the TV se ...

Other uses

* ''e'' (novel), a 2000 comic novel by Matt Beaumont *

E band (disambiguation) E band may refer to: * E (band), a Czech experimental rock band * E band (NATO), a radio frequency band from 2 to 3 GHz * E band (waveguide) The waveguide E band is the range of radio frequencies from 60 GHz to 90 GHz in the electromag ...

* E#, a team's

elimination number In certain sports, a magic number is a number used to indicate how close a front-running team is to clinching a division title and/or a playoff spot. It represents the total of additional wins by the front-running team or additional losses (or a ...

* E, the slang name for the recreational drug Ecstasy, also called MDMA * E, or the

Elohist According to the documentary hypothesis, the Elohist (or simply E) is one of four source documents underlying the Torah,McDermott, John J., ''Reading the Pentateuch: A Historical Introduction'' (Pauline Press, 2002) p. 21. Via Books.google.com.a ...

, 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 the United States and Canada. The ESRB was established in 1994 by the Entertainment Software Asso ...

which is suitable for all ages. * Dominical letter E for a common year starting on Wednesday * 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 * ''

"E" Is for Evidence ''"E" Is for Evidence'' is the fifth novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone, a private eye based in Santa Teresa, California. The premise of the book elaborates on Kinsey's personal history sinc ...

'', the fifth novel in Sue Grafton's "Alphabet mystery" series, published in 1988 * E, or Eredivisie, The Symbol Of The Eredivisie Logo.