Eta Eta (uppercase , lowercase ; grc, ἦτα ''ē̂ta'' or ell, ήτα ''ita'' ) is the seventh letter of the Greek alphabet, representing the close front unrounded vowel . Originally denoting the voiceless glottal fricative in most dialects, ...

(Η, η) is the seventh letter of the Greek alphabet Eta or ETA may also refer to:

People

Eta (given name) Eta is a female given name. Notable people with the name include: *Eta Boeriu (1923–1984), Romanian writer * Eta Cohen (1916–2012), English violinist * Eta Hentz (1895-1986), Hungarian-American fashion designer (working as Madame Eta) *Eta Linn ...

* Eta, a derogatory term for the

Burakumin is a name for a low-status social group in Japan. It is a term for ethnic Japanese people with occupations considered as being associated with , such as executioners, undertakers, slaughterhouse workers, butchers, or tanners. During Japan's ...

in the Japanese feudal era * ETA, an Elvis Tribute Artist

Aircraft

* Eta (glider), a German glider *

CNA Eta The CNA Eta was a single engine Italian light aircraft, flown in the mid-1930s, that set one and two seat world records as both a landplane and a seaplane. Only one or two were built. Design and development During the 1920s the Compagnia Naziona ...

, an Italian aircraft

Brands and enterprises

* Eta, a snack food brand owned by

Griffin's Foods The Griffin's Foods Company is a New Zealand food company currently headquartered in Auckland and established by John Griffin as a flour and cocoa mill in the city of Nelson in 1864.Empresa de Transporte Aéreo, a defunct Brazilian Airline *

Environmental Transport Association The Environmental Transport Association (ETA) is a British carbon-neutral provider of vehicle breakdown, bicycle and travel insurance for the environmentally concerned consumer. Unlike the AA or the RAC which are perceived as pro-car, the ET ...

, a British roadside assistance company *

ETA SA ETA SA Manufacture Horlogère Suisse (ETA SA Swiss Watch Manufacturer) designs and manufactures quartz watches and both hand-wound and automatic-winding mechanical and movements. Commonly referred to as ETA, the company is headquartered in Gren ...

, a Swiss watchmaking company * ETA Star Group, a Dubai-based investment company *

ETA Systems Eta (uppercase , lowercase ; grc, ἦτα ''ē̂ta'' or ell, ήτα ''ita'' ) is the seventh letter of the Greek alphabet, representing the close front unrounded vowel . Originally denoting the voiceless glottal fricative in most dialects, ...

, a defunct American computer manufacturer * ETA a.s., a Czech electrical appliances manufacturer

Education

* Engineering & Technologies Academy, in San Antonio, Texas, United States *

Ethiopian Teachers' Association The Ethiopian Teachers' Association (ETA) is a trade union in Ethiopia. It is affiliated with Education International. Background The ETA formed in February 1949 by 32 teachers from Minilik Senior Secondary School, located in Addis Abba, the cap ...

, a trade union *

Evangelical Theological Academy The Evangelical Theological Academy (Dutch: ''Evangelische Theologische Academie'', ETA) is a Dutch interdenominational institute for evangelical theological education, in Zwijndrecht, Netherlands. The ETA was founded in 1985 by five theologicall ...

, in Zwijndrecht, Netherlands * Evangelical Theological Association, a former teaching institute in Melbourne, Australia

Government and politics

* ETA (separatist group) (Basque: '), a Basque armed separatist group *

Electronic Travel Authorization An electronic visa, electronic entry visa or electronic travel authorisation/electronic travel authority (ETA) is a travel permit in an electronic form. It is often required in addition to a valid passport for access into a particular jurisdictio ...

or Electronic Travel Authority, an alternative to a travel visa required by many countries for entry *

Employment and Training Administration The Employment and Training Administration (ETA) is part of the U.S. Department of Labor. Its mission is to provide training, employment, labor market information, and income maintenance services. ETA administers federal government job training and ...

, of the United States Department of Labor * European Technical Assessment of the

European Organisation for Technical Approvals European Organisation for Technical Assessment (EOTA) (german: Europäische Organisation für Technische Bewertung, french: Organisation européenne pour l'évaluation technique) is a European non-profit association. Its primary purpose is to draft ...

Mathematics

Dedekind eta function In mathematics, the Dedekind eta function, named after Richard Dedekind, is a modular form of weight 1/2 and is a function defined on the upper half-plane of complex numbers, where the imaginary part is positive. It also occurs in bosonic string ...

Dirichlet eta function In mathematics, in the area of analytic number theory, the Dirichlet eta function is defined by the following Dirichlet series, which converges for any complex number having real part > 0: \eta(s) = \sum_^ = \frac - \frac + \frac - \frac + \cdo ...

Eta conversion Lambda calculus (also written as ''λ''-calculus) is a formal system in mathematical logic for expressing computability, computation based on function Abstraction (computer science), abstraction and function application, application using variable ...

Eta invariant In mathematics, the eta invariant of a self-adjoint elliptic differential operator on a compact manifold is formally the number of positive eigenvalues minus the number of negative eigenvalues. In practice both numbers are often infinite so are de ...

Weierstrass eta function In mathematics, the Weierstrass functions are special functions of a complex variable that are auxiliary to the Weierstrass elliptic function. They are named for Karl Weierstrass. The relation between the sigma, zeta, and \wp functions is analogou ...

* The small letter eta is used as

't Hooft symbol The t Hooft symbol is a collection of numbers which allows one to express the generators of the SU(2) Lie algebra in terms of the generators of Lorentz algebra. The symbol is a blend between the Kronecker delta and the Levi-Civita symbol. It was ...

Science and technology

Eicosatetraenoic acid Eicosatetraenoic acid (ETA) designates any straight chain 20:4 fatty acid. Eicosatetraenoic acid belongs to the family of eicosanoids, molecules synthesized from oxidized polyunsaturated fatty acids (PUFAs) to mediate cell-cell communication. The ei ...

Eta meson The eta () and eta prime meson () are isosinglet mesons made of a mixture of up, down and strange quarks and their antiquarks. The charmed eta meson () and bottom eta meson () are similar forms of quarkonium; they have the same spin and parity ...

Ethanolamine Ethanolamine (2-aminoethanol, monoethanolamine, ETA, or MEA) is an organic chemical compound with the formula or . The molecule is bifunctional, containing both a primary amine and a primary alcohol. Ethanolamine is a colorless, viscous liquid w ...

Event tree analysis Event tree analysis (ETA) is a forward, top-down, logical modeling technique for both success and failure that explores responses through a single initiating event and lays a path for assessing probabilities of the outcomes and overall system anal ...

Exfoliatin Exfoliatin is a '' Staphylococcus aureus'' exotoxin that causes a blistering of the skin known as staphylococcal scalded skin syndrome, usually in infants. Exfoliatins are glutamate-specific serine proteases highly specific to desmoglein I, a ...

Hapticity In coordination chemistry, hapticity is the coordination of a ligand to a metal center via an uninterrupted and contiguous series of atoms. The hapticity of a ligand is described with the Greek letter η ('eta'). For example, η2 describes a l ...

Pseudorapidity In experimental particle physics, pseudorapidity, \eta, is a commonly used spatial coordinate describing the angle of a particle relative to the beam axis. It is defined as :\eta \equiv -\ln\left tan\left(\frac\right)\right where \theta is the a ...

* Reproduction factor, in the nuclear engineering

four factor formula The four-factor formula, also known as Fermi's four factor formula is used in nuclear engineering to determine the multiplication of a nuclear chain reaction in an infinite medium. The symbols are defined as: *\nu, \nu_f and \nu_t are the averag ...

Viscosity The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity quantifies the inte ...

* Entropy as defined in Boltzmann's

H-theorem In classical statistical mechanics, the ''H''-theorem, introduced by Ludwig Boltzmann in 1872, describes the tendency to decrease in the quantity ''H'' (defined below) in a nearly-ideal gas of molecules. L. Boltzmann,Weitere Studien über das Wä ...

SARS-CoV-2 Eta variant The Eta variant is a variant of SARS-CoV-2, the virus that causes COVID-19. The Eta variant or lineage B.1.525, also called VUI-21FEB-03 (previously VUI-202102/03) by Public Health England (PHE) and formerly known as UK1188, 21D or 20A/S:484K, ...

, one of the variants of SARS-CoV-2, the virus that causes COVID-19

Music

* "E.T.A.", a song by

Justin Bieber Justin Drew Bieber ( ; born March 1, 1994) is a Canadian singer. Bieber is recognized for his genre-melding musicianship and has played an influential role in modern-day popular music. He was discovered by American record executive Scooter ...

from the album ''

Changes Changes may refer to: Books * ''Changes'', the 12th novel in Jim Butcher's ''The Dresden Files'' Series * ''Changes'', a novel by Danielle Steel * ''Changes'', a trilogy of novels on which the BBC TV series was based, written by Peter Dickinson ...

'', 2020 * "ETA", a song by Dr. Dre, Snoop Dogg, Busta Rhymes and Anderson .Paak from

The Contract A contract is a legally binding agreement between at least two parties. Contract may also refer to: Film and television Film * ''The Contract'' (1971 film), an Israeli comedy film * ''The Contract'' (1972 film) or ''Caliber 9'', an Italian crime ...

EP, 2022

Other uses

Estimated time of arrival The estimated time of arrival (ETA) is the time when a ship, vehicle, aircraft, cargo, emergency service, or person is expected to arrive at a certain place. Overview One of the more common uses of the phrase is in public transportation where the ...

* England Touch Association, the national governing body for touch rugby within England *

Hurricane Eta Hurricane Eta was a deadly and erratic Category 4 hurricane that devastated parts of Central America in early November 2020. The record-tying twenty-eighth named storm, thirteenth hurricane, and sixth major hurricane of the extremely-active 20 ...

, a damaging and deadly Category 4 hurricane that occurred in the 2020 Atlantic hurricane season * 'eta, a letter or glottal stop in the Tahitian languages *

Electronics Technicians Association The Electronics Technicians Association, International® (doing business as ETA® International) is a US-based not-for-profit 501(c)(6) trade association founded in 1978. The association provides certifications in industries such as basic electroni ...

, a professional association * '' Landolphia owariensis'', a vine native to Africa and sometimes known as eta * Edited To Add, used on blogs and other internet posts.