# E (disambiguation)

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

## Computing and computation

* E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s
* E (complexity), 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), a modern, high performance prover for first-order logic
* e (verification language) hardware verification language
* Amiga E, a programming language
* E or Enlightenment (software), a free software open source manager for X Window System

## 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
* Mini E, an electric hatchback built as a demonstration car
* Honda e, an electric hatchback
* 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) of the Buenos Aires Subte
* RER E, a line in the RER of Paris
* Toei Ōedo Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled
* The official West Japan Railway Company service symbol for:
** San'in Main Line.
** Kisuki Line.

## Geography

* E or east, one of the four cardinal directions
* E (state), a vassal state in Zhou Dynasty China (1046–256 BC)
* E Township, Maine, an unincorporated community in USA
* Mount E (Japanese: 恵山, romanized: E-san, lit. 'Mount Wisdom'), a stratovolcano on Oshima Peninsula, Japan
* River E, a river in Scotland
* E postcode area, for east London
* E, New Brunswick's postal code
* Hubei, abbreviated in Chinese as È (鄂), a province of China

## Languages

* É (temple), Sumerian word for house or temple
* E language, a language of China
* 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
* 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

* e (mathematical constant), a mathematical constant also known as Euler's number and Napier's constant
* 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
* $\operatorname {E} [X]$ or expected value, the average expected outcome of a trial in probability theory
* E, the complete elliptic integral of the second kind
* e, the identity element
* E, the Erdős–Borwein constant

## 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 Glu), an abbreviation for glutamic acid or glutamate
* 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
* Estrogen (medication)
* Estradiol (medication)

## Music

* E (musical note)
* E major, a scale
* E minor, a scale
* E major chord, see Chord names and symbols (popular music)
* 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, 1992

## People

* E (surname) (Chinese: 鄂), Chinese surname
* E, a nickname of Mark Oliver Everett, 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)

## 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 10$^{18}$
* 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 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

## Television and film

* E!, Entertainment Television, an American cable and satellite TV network
** E! (Australia and New Zealand), the defunct Australian and New Zealand 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, a character from the television series Entourage
* E, the production code for the 1964 Doctor Who serial The Keys of Marinus
* E (Exempt), an unofficial category in the British Board of Film Classification 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, one of the four sources of the Torah
* E, or Everyone, a video game rating symbol used by the 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, the symbol of the Eredivisie logo