// Workers AI · dad joke modeWhat did E say to its duplicate? "You're a copy, e-actly like me.

E is the fifth letter of the Latin alphabet.

E, e, or e- may also refer to:

Computing and mathematics

See also: §§ Gaming and Telecommunication

Computer hardware

eMachines, a brand of personal computers, founded 1998, first acquired 2004, and discontinued 2013

User interfaces

Enlightenment (window manager), a compositing window manager for the X Window System
/e/ (operating system), a fork of LineageOS, which in turn is based on Android
E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s
E (PC DOS), a text editor

Programming languages and provers

E (programming language), an object-oriented programming language created by Electric Communities for secure distributed computing
Amiga E, a programming language created by Wouter van Oortmerssen
e (verification language) hardware verification language
E (theorem prover), a modern, high performance prover for first-order logic

Logic and abstract mathematics

E (complexity), a set of decision problems solvable by a Turing machine in a specific time
∃, the symbol for existential quantification ("there exists"), in predicate logic
- ∃!, the symbol for uniqueness quantification ("there exists only/exactly one")
$e$ , the identity element (e.g. 0 for addition, 1 for multiplication)
∈, notation indicating that an object is a member or element of a set

Concrete mathematics

E (digit), representing 14 in positional numeral systems of a base of 15 or higher, such as hexadecimal
E notation, or scientific notation, a way of writing very large and very small numbers such as 5E7
$\operatorname {E} [X]$ or expected value, the average expected outcome of a trial in probability theory
$E$ , the complete elliptic integral of the second kind
$E$ , the Erdős–Borwein constant, equal to 1.60669...
$e$ (mathematical constant), also known as Euler's number and Napier's constant, equal to 2.71828...
e or orbital eccentricity, a measure of how much a conic section deviates from a circle

Science and engineering

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 or Equal Energy spectrum, a definition of white in colour printing
(E), E–Z notation used in chemistry to indicate double bonds that two groups of higher priority are on opposite sides

Biology and Medicine

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, a group of chemically related vitamins
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)
E-site, the exit binding site for t-RNA

Electricity

e, one of two fundamental subatomic particles:
- e⁻
  , electron
- e⁺
  , positron
e or elementary charge, the absolute value of the electric charge carried by a single electron
E region (between D and F) or the Kennelly–Heaviside layer, part of the ionosphere
E, the symbol for an electric field
E, the electrode potential, the electromotive force of a cell built of two electrodes
- E° or $E^{\ominus }$ , the standard electrode potential

Telecommunication

See also: § Television

E band (disambiguation)
E or EDGE, for Enhanced Data Rates for GSM Evolution

Commerce and transportation

€, the euro sign, the symbol for the euro, the European Union's standard currency unit
℮, the estimated sign, an EU symbol declaring that the weight or volume of pre-packaged goods is within specific allowable tolerances
E or Eni, an Italian oil and gas company

Vehicles

E, the letter designating an electric locomotive in Poland
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

Transit routes

E (AC Transit), a bus service in the San Francisco Bay Area, California
RapidRide E Line, a limited-stop bus route operated by King County Metro, Washington
: E Embarcadero, a San Francisco Municipal Railway historic streetcar line
E (Los Angeles Railway), a streetcar route in California
: E Line (Los Angeles Metro), formerly the Expo Line, a light rail line in California
: E (New York City Subway service), AKA Eighth Avenue Local
: Green Line E branch, AKA the Huntington Avenue branch, formerly the Arborway Line, of the Massachusetts Bay Transportation Authority (MBTA) subway
: E Line (RTD), a Regional Transportation District light rail line in Denver metropolitan area, Colorado
: Line E (Buenos Aires Underground), in Argentina
: E (S-train), in Copenhagen, Denmark
: RER E, a line in the Réseau Express Régional, Paris, France
: Toei Ōedo Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation
The official West Japan Railway Company service symbol for:
- : San'in Main Line
- : Kisuki Line

Car license plates

E, the international vehicle registration code for vehicle registration plates of Spain
E, the prefix in vehicle registration plates of Indonesia for Cirebon, Majalengka, Indramayu and Kuningan

Places

Political

Chinese: 鄂
- E (state), a vassal state in Zhou Dynasty China (1046–256 BC)
- Hubei, abbreviated in Chinese as È, a province of China
E Township, Maine, an unincorporated community in USA
E postcode area, for east London
E, New Brunswick's postal code

Geographical

E or east, one of the four cardinal directions
Mount E (Japanese: 恵山, romanized: E-san, lit. 'Mount Wisdom'), a stratovolcano on Oshima Peninsula, Japan
River E, a river in Scotland

Language and linguistics

See also: §§ Literature and Programming languages and provers

É (temple), Sumerian word for house or temple
E language, a Tai–Chinese mixed language spoken primarily in Rongshui Miao Autonomous County, Guangxi, China
E, the Spivak pronoun meaning "he" or "she"
e, the close-mid front unrounded vowel IPA symbol
E- (prefix), an Internet-related prefixed used in words such as e-mail
É (cuneiform), a common-use sign
E (Indic), a vowel of Indic abugidas, pronounced /eː/; when an independent vowel, it is written in various scripts as: , , ए, এ, ஏ, ఏ, ଏ, ಏ, ഏ, એ, ਏ, 𑀏, 𑖊, 𑌏, ꡠ, 𑐊, 𑰊, 𑆍, ဧ, ᦵ, ឯ, เ, ꪵ, එ, 𑄆, ᥫ, 𑤆, ꢌ, ꨃ, 𑘊, 𑦪, 𑒋, ꫠ, 𑚆, 𑠆, 𑈄, 𑊶, 𑅓, 𑊃, ᬏ, ꦌ, ᮈ, 𑴆, ᐁ
E (Mongolic), ᠧ, also used in Tungusic languages
E (hangul), ㅔ, used in Korean
E (kana), え/エ, used in Japanese
E (Cyrillic), Э/э

Similar-looking letters

Ɛ/ɛ, the letter epsilon in the Latin alphabet
Ε/ε/ϵ, the letter epsilon in the Greek alphabet
ⴹ, the letter yaḍ in the Tifinagh alphabet
Е/е, the letter ye in the Cyrillic alphabet
ㅌ, the hangul tieut in the Korean alphabet
ꗋ, the syllable tɔ in the Vai syllabary
Ꭼ/ꭼ, the syllable gv/kə̃ in the Cherokee syllabary
ᰀ, the consonant ka in the Lepcha script
ꯐ, the letter pham in the Meitei script
𐐁/𐐩, the letter long E in the Deseret alphabet
𖼬, the consonant nya in the Pollard script
ᗴ, the syllable cha in a Chipewyan script in the Canadian Aboriginal syllabics family
عـ/ـعـ/ـع/ع, the letter 'ayn in the Arabic alphabet
٤, the digit four in the Eastern Arabic numerals
𐎅, the letter h in the Ugaritic alphabet
Ҽ, the letter che in the Cyrillic script alphabet of the Abkhaz language

Arts and media

Music

Music theory

E (musical note)
- E major, a scale
- E minor, a scale
- E, the chord notation for the E major triad

Albums

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

Other uses in music

E, a nickname of Mark Oliver Everett, musician and front man of the rock band Eels
E (band), active 1984–1997, a Czech experimental rock group from Brno
E (video), by Eminem, 2000
"E" (Saves the Day song), from 2011 album Daybreak
"E (Ventex)", a 2020 single by Albatraoz featuring Ture Brute, included on Albumtraoz

Television

See also: § Telecommunication

E, short for "episode"; commonly combined with "S" for season
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, 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

Film

E (Exempt), an unofficial category in the British Board of Film Classification rating system
E, an alias of Edna Mode, a character from the movie The Incredibles
E (2006 film), transl. The Fly, a Indian Tamil-language medical thriller film
E (2017 film), an Indian Malayalam-language supernatural horror film
E (2025 film), a Finnish experimental drama film

Literature

See also: § Language and linguistics

e (novel), a 2000 comic novel by Matt Beaumont
E, or the Elohist, one of the four sources of the Torah

Gaming

E, or Everyone, a video game rating symbol used by the Entertainment Software Rating Board which is suitable for all ages
e, a nickname of Eric Neustadter, Former Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast

Sports

E#, a team's elimination number
E, the symbol of the Eredivisie logo

Other uses

Dominical letter E for a common year starting on Wednesday
E (surname) (Chinese: 鄂), Chinese surname
E, a fail or almost-fail in many grading systems by country
Mrs. E, the pseudonym of the legal guardian and respondent in E (Mrs) v Eve, a 1986 Supreme Court of Canada judgement on performing proxy-consented, non-therapeutic medical procedures on people of diminished mental capacity
E (cup size), a bra measurement descriptor
E (grade), a failing or barely passing mark in many grading systems
E (meme), based on images of Markiplier, Lord Farquaad, and Mark Zuckerberg

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// Workers AI · dad joke modeWhat did E say to its duplicate? "You're a copy, e-actly like me.

Computing and mathematics

Computer hardware

User interfaces

Programming languages and provers

Logic and abstract mathematics

Concrete mathematics

Science and engineering

Biology and Medicine

Electricity

Telecommunication

Commerce and transportation

Vehicles

Transit routes

Car license plates

Places

Political

Geographical

Language and linguistics

Similar-looking letters

Arts and media

Music

Music theory

Albums

Other uses in music

Television

Film

Literature

Gaming

Sports

Other uses

See also