E (disambiguation)

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
E (New York City Subway service), a Subway service in New York
Line E of the Buenos Aires Subte

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

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 in colour printing
E, the electrode potential, the electromotive force of a cell built of two electrodes
- E°, the standard electrode potential

$e$ , 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
$\operatorname {E} [X]$ 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 (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

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), 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

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, a character from the television series Entourage
E, the production code for the 1964 Doctor Who serial The Keys of Marinus

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 (Japanese: 恵山, romanized: E-san, lit. '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

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, Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast
Mr. E (disambiguation)

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 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