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
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.

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

$e$ (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

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
Estradiol (medication), particularly in transgender contexts

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)

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° or ${\displaystyle E^{\ominus ))$ , the standard electrode potential

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 (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