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 * E, a Polish electric locomotive in PKP classification system * 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 (Buenos Aires Underground), Line E of the Buenos Aires Subte

Medicine and genetics

* E number, 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, 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'', 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 * 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 absolute value of the electric charge carried by a single electron. * e or coefficient of restitution (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-, the SI prefix for 10¹⁸ * E-layer or the Kennelly-Heaviside layer, part of the ionosphere * E, the symbol for an electric field * e or orbital eccentricity, a measure of how much a conic section deviates from a circle * E or Equal Energy spectrum, a definition of white point, 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, 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 and other positional numeral systems of a base of 15 or higher *

\operatorname[X]

or Expected value, the average expected outcome of a trial in probability theory * , the Elliptic integral#Complete elliptic integral of the second kind, complete elliptic integral of the second kind * , the identity element * , the Erdős–Borwein_constant

Computing and computation

* E (complexity), a set of decision problems solvable by a Turing machine in a specific time * E (PC DOS), a text editor * E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s * E (programming language), an object-oriented programming language * e (verification language) 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), a fork of LineageOS, which in turn is based on Android

Music

* E (musical note) * E major, a scale * E minor, a scale * E major chord, Chord names and symbols (popular music) * E, a nickname of Mark Oliver Everett, musician and front man of the rock band Eels * E (video), ''E'' (video), by Eminem * E (Adrian Belew album), ''E'' (Adrian Belew album), 2009 * É (album), ''É'' (album), by Duda Brack, 2015 * E (Enslaved album), ''E'' (Enslaved album), 2017 * E (Epik High album), ''E'' (Epik High album), 2009 * E (single album), ''E'' (single album), by Big Bang, 2015 * ''E'', a 2019 album by Ecco2K * "E", a song by Baboon from ''Sausage (album), 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), ''E'' (2006 film), a 2006 Tamil film * E (2017 film), ''E'' (2017 film) * E, or Edna Mode, a character from the movie ''The Incredibles'' * E, or Eric Murphy, a character from the television series ''Entourage'' *E, the production code for the 1964 ''Doctor Who'' serial ''The Keys of Marinus''

Geography

* E or east, one of the four cardinal directions * E Township, Maine, an unincorporated community in USA * E (state), a vassal state in Zhou Dynasty China (1046–256 BC) * River E, 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 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)

Other uses

* e (novel), ''e'' (novel), a 2000 comic novel by Matt Beaumont * E band (disambiguation) * E#, a team's elimination number * E, the slang name for the recreational drug Ecstasy, also called MDMA * E, or the Elohist, one of the four sources of the Torah * E, or Everyone, a video game rating symbol used by the Entertainment Software Rating Board#Ratings, Entertainment Software Rating Board 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'', the fifth novel in Sue Grafton's "Alphabet mystery" series, published in 1988 * E, or Eredivisie, The Symbol Of The Eredivisie Logo.