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E (disambiguation)

About 5 pages (1,357 words)

E is the fifth letter of the Latin alphabet. It can also refer to the following.

In astronomy,
- E stands for a March 1 through 15 discovery, in the provisional designation of a comet (e.g. C/1973 E1, Comet Kohoutek) or asteroid (e.g. (4178) 1988 EO₁).
- E would stand for Earth, in the provisional designation of any ring or natural satellite discovered around it.
- e stands for eccentricity, a measure of how much a conic section deviates from a circle.
In biochemistry,
- E is the symbol for glutamic acid.
- E is an abbreviation for enzyme.
In colorimetry, E denotes the equal energy white point.
In the Earth's atmosphere, the E layer is part of the ionosphere.
In electrochemistry,
- E is a symbol for electrode potential.
- E° is a symbol for standard electrode potential.
In genetics,
- Haplogroup E (mtDNA) is a human mitochondrial DNA (mtDNA) haplogroup.
- Haplogroup E (Y-DNA) is a Y-chromosomal DNA (Y-DNA) haplogroup.
In microbiology, the E in E. coli can stand for either Escherichia, or less commonly, Entamoeba.
In nutrition,
- Vitamin E.
- E number refers to a European coding scheme for food additives.
In physics,
- E is the symbol for energy, as in <math>E=mc^2</math> (see mass-energy equivalence).
- E is the symbol for electric field.
- In particle physics, e (or e^-) is the symbol for the electron.
- In semiconductor physics, e may represent elementary charge.
In the SI system, E, exa, is the SI prefix meaning 10¹⁸.
In engineering, E stands for the modulus of elasticity.

The mathematical constant e, known as Euler's number or Napier's constant, a transcendental number (approximately equal to 2.718281828459045235360287471352) which is the base of the exponential function and the natural logarithm.
e (small caps) signifies y×10^z, as in 7e8 = 7×10⁸, or 700,000,000.
In hexadecimal (and other positional numeral systems with a radix of 15 or greater), E is a digit meaning fourteen.
In probability and statistics, a capital E or blackboard bold <math>\mathbb{E}</math> denotes expected value.
In set theory, <math>\in</math> denotes set membership.
In symbolic logic, ∃ (a backwards E) is the symbol for "there exists...", called the existential quantifier. Example: <math>\exists x\,(x+1=3)</math>.

E is a programming language for the Amiga; see AmigaE.
E is an object-oriented language for secure distributed computing; see E (programming language).
e is a functional verification language; see e (verification language).
e (or E) is used in floating point literals in many programming languages to mean "multiply by 10 to the power of".
- Example: In the FORTRAN programming language 6.0221415E23 is equivalent to 6.0221415 × 10²³.
- The ALGOL^[1]^[2] programming language also uses this "E notation", alternatively - when available - either character '₁₀' or '\' can be used, for example: 6.0221415₁₀23 and 6.0221415\23.
The letter e is often used as a prefix (with or without a subsequent hyphen) to imply "electronic", such as e-mail or e-commerce.
In computational complexity theory, the complexity class E is a variant of the EXPTIME class of problems solvable in exponential time.
In the X Window System, E is short for Enlightenment.
E is text editor in PC-DOS 7, PC-DOS 2000, and OS/2; see E (PC-DOS).
e is a Windows text editor; see e (text editor).
E is a theorem prover for first-order logic.

In music,
- E is the third note (about 330 Hz) of the solfege, also known as Mi. See E (musical note)
- "E" is a nickname of Mark Oliver Everett, frontman for the rock band Eels.
- "E" is a song by the Japanese band Asian Kung-Fu Generation.
In literature,
- E is the alternative name of the Elohist, the author of one of the four divisions of the Torah.
- e is a 2000 novel by Matt Beaumont.
In film,
- E is a Tamil film starring Jeeva and Nayantara; see E (film).
- E is a Canadian film from 1982.
- "E" is the nickname of Edna Mode, a character from the movie The Incredibles.
In television,
- E! (Entertainment Television) is an American cable television and direct broadcast satellite network.
- "E" is the nickname if character Eric Murphy in the television series Entourage.
In video games, E is the ESRB rating symbol for Everyone.

The E line, a subway/metro line in New York City.
In California, E in a diamond or octagon on a license plate represents a government owned vehicle.
In international licence plate codes, E stands for Spain (España).
In Polish locomotives designation E stands for electric locomotive.
"E class" is a steam locomotive classification used by the New Zealand Railways Department; see NZR E class (1872), NZR E class (1906), NZR E class (1922).

In currency, E is sometimes used as symbol for the euro when the symbol € is not available.
In the stock market, E is the New York Stock Exchange ticker symbol for ENI Spa.
In legal metrology, the "estimated" sign (the symbol ℮) following a measurement of quantity (e.g., 750 ml ℮) indicates that the measurement of weight or volume is done according to preset rules with specific allowable variances.

In geography and weather forecasting, E stands for east, one of the four cardinal directions.
As the first letter of a postal code,
- In Canada, E stands for New Brunswick.
- In the United Kingdom, E stands for East London.
E Township is an unincorporated community in Maine, United States, previously called E Plantation.

In gender-neutral pronouns, e is the Spivak pronoun meaning he or she.
In Interlingua and Portuguese, e means and.
In Spanish, e means and as an alternative for the more common y when it precedes a word starting with i or y.
In the International Phonetic Alphabet, /e/ refers to the close-mid front unrounded vowel. Its turned counterpart, /ə/, stands for the mid central vowel or schwa.
In Japanese, E is a romanization of the kana え and エ.
In linguistics, the E language is spoken in Guangxi, south central China, by the Zhuang.
É is the Sumerian for "temple"; see É (temple).
In English slang, E is a term for Methylenedioxymethamphetamine (MDMA or Ecstasy), a synthetic drug which is often used recreationally.
In Romania, E is a symbol of parthenogenesis.

In education, E is a very low grade, except in some grading systems such as the one used in the USA which goes from D to F, omitting E. Also may be short for 'excellent'.
E denotes the state of enlistment in military, noted before rank.
In sports, E# refers to a team's elimination number.

In radio, the NATO E band ranges from 2 to 3 GHz.
E, The Environmental Magazine is a US-based magazine focusing on global environmental issues.
Unknown Man E is a mystery mummy in Egypt.

References

Latin letter disambiguation
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