For the Latin letter and IPA symbol that represents velar nasal, see ŋ.
This article is about the Greek letter. For other uses, see Eta (disambiguation).
Greek alphabet
Αα
Alpha
Νν
Nu
Ββ
Beta
Ξξ
Xi
Γγ
Gamma
Οο
Omicron
Δδ
Delta
Ππ
Pi
Εε
Epsilon
Ρρ
Rho
Ζζ
Zeta
Σσς
Sigma
Ηη
Eta
Ττ
Tau
Θθ
Theta
Υυ
Upsilon
Ιι
Iota
Φφ
Phi
Κκ
Kappa
Χχ
Chi
Λλ
Lambda
Ψψ
Psi
Μμ
Mu
Ωω
Omega
History
Archaic local variants
Ϝ
Ͱ
Ϻ
Ϙ
Ͳ
Ͷ
tsan
digamma
Diacritics
Ligatures
Numerals
ϛ (6)
ϟ (90)
ϡ (900)
Use in other languages
Bactrian
Coptic
Albanian
Related topics
Use as scientific symbols
Category
v
t
e
Eta (/ˈiːtə,ˈeɪtə/EE-tə, AY-tə;[1] uppercase Η, lowercase η; Ancient Greek: ἦταē̂ta[ɛ̂ːta] or Greek: ήταita[ˈita]) is the seventh letter of the Greek alphabet, representing the close front unrounded vowel, [i]. Originally denoting the voiceless glottal fricative, [h], in most dialects of Ancient Greek, its sound value in the classical Attic dialect was a long open-mid front unrounded vowel, [ɛː], which was raised to [i] in Hellenistic Greek, a process known as iotacism or itacism.
In the ancient Attic number system (Herodianic or acrophonic numbers), the number 100 was represented by "Η", because it was the initial of ΗΕΚΑΤΟΝ, the ancient spelling of ἑκατόν = "one hundred". In the later system of (Classical) Greek numerals eta represents 8.
Eta was derived from the Phoenician letter heth . Letters that arose from eta include the Latin H and the Cyrillic letters И and Й.
^"eta". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
Eta (/ˈiːtə, ˈeɪtə/ EE-tə, AY-tə; uppercase Η, lowercase η; Ancient Greek: ἦτα ē̂ta [ɛ̂ːta] or Greek: ήτα ita [ˈita]) is the seventh letter of the Greek...
ETA SA Manufacture Horlogère Suisse (ETA SA Swiss Watch Manufacturer) designs and manufactures quartz watches and both hand-wound and automatic-winding...
Eta Carinae (η Carinae, abbreviated to η Car), formerly known as Eta Argus, is a stellar system containing at least two stars with a combined luminosity...
The Eta Aquariids are a meteor shower associated with Halley's Comet. The shower is visible from about April 19 to about May 28 each year with peak activity...
workers, butchers, and tanners. The term encompasses both the historical eta and hinin outcasts. During Japan's feudal era, these occupations acquired...
The eta ( η ) and eta prime meson ( η′ ) are isosinglet mesons made of a mixture of up, down and strange quarks and their antiquarks. The charmed eta meson...
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...
eta function may refer to: The Dirichlet eta function η(s), a Dirichlet series The Dedekind eta function η(τ), a modular form The Weierstrass eta function...
Eta Leonis (η Leo, η Leonis) is a fourth-magnitude star in the constellation Leo, about 1,270 light years away. Eta Leonis is a white supergiant with...
ETA Star Group is an investment company headquartered in Dubai, United Arab Emirates. It is a joint-venture between Al Ghurair and Tamil entrepreneur...
The Basque conflict, also known as the Spain–ETA conflict, was an armed and political conflict from 1959 to 2011 between Spain and the Basque National...
Eta Moiseyevna Tyrmand (Belarusian: Эта Майсееўна Ты́рманд, romanized: Eta Majsiejeŭna Tyrmand; Russian: Эта Моисеевна Тырманд; February 23, 1917 – April...
Askatasuna (ETA), a paramilitary and armed Basque separatist movement, mainly in Spain. The list includes attacks by all the branches and divisions that ETA had...
The Carina Nebula or Eta Carinae Nebula (catalogued as NGC 3372; also known as the Great Carina Nebula) is a large, complex area of bright and dark nebulosity...
Eta Persei (η Persei, abbreviated Eta Per, η Per), is a binary star and the 'A' component of a triple star system (the 'B' component is the star HD 237009)...
Korea without a visa (Korea Electronic Travel Authorization (K-ETA) or without a K-ETA at all. Citizens of certain other countries are required to have...
ETA Systems was a supercomputer company spun off from Control Data Corporation (CDC) in the early 1980s in order to regain a footing in the supercomputer...
Eta Kappa Nu is the international honor society of the Institute of Electrical and Electronics Engineers (IEEE). Following is a list of Eta Kappa Nu chapters...
Eta Cassiopeiae (η Cassiopeiae, abbreviated Eta Cas, η Cas) is a binary star system in the northern constellation of Cassiopeia. Its binary nature was...
Eta Virginis (η Virginis, abbreviated Eta Vir, η Vir) is a triple star system in the zodiac constellation of Virgo. From parallax measurements taken during...
In mathematics, the eta invariant of a self-adjoint elliptic differential operator on a compact manifold is formally the number of positive eigenvalues...
Global Information
. Letters that arose from eta include the Latin H and the Cyrillic letters И and Й.