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, 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#Type approval, World Forum for Harmonization of Vehicle Regulations * E (Los Angeles Railway) * E (New York City Subway service), 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.