Epsilon

Greek alphabet
[[Image:Greek alphabet {{{letter\|alpha-omega}}}.png\| 200px\|center]]
Α α Alpha	Β β Beta
Γ γ Gamma	Δ δ Delta
Ε ε Epsilon	Ζ ζ Zeta
Η η Eta	Θ θ Theta
Ι ι Iota	Κ κ Kappa
Λ λ Lambda	Μ μ Mu
Ν ν Nu	Ξ ξ Xi
Ο ο Omicron	Π π Pi
Ρ ρ Rho	Σ σ ς Sigma
Τ τ Tau	Υ υ Upsilon
Φ φ Phi	Χ χ Chi
Ψ ψ Psi	Ω ω Omega
obsolete letters
Image:Greek alphabet digamma2.png Digamma	Image:Greek alphabet san.png San
Image:Greek alphabet qoppa.png Qoppa	Image:Greek alphabet sampi.png Sampi
Image:Greek alphabet stigma.png Stigma	Image:Greek alphabet sho.png Sho

For the 2005 hurricane, see Hurricane Epsilon.

"E psilon" ("simple e") was coined to distinguish the letter from αι, which by the medieval period was pronounced the same way.

Symbol

The upper-case Epsilon is not a very often used symbol outside of the Greek language because of its similarity to the Roman letter E.

The lower-case letter ε is used as the symbol for:

In mathematics (particularly calculus), a small positive quantity, usually denoted ε; see limit.
- By analogy with this, the late mathematician Paul Erdős also used the term "epsilons" to refer to children (Hoffman 1998, p. 4).
In set theory, the limit ordinal of the sequence <math>\omega,\omega^{\omega},\omega^{\omega^{\omega}},\dots</math>.
In computing, the precision of a numeric data type.
In computer science, the empty string, though different writers use a variety of other symbols for the empty string as well, including the lower case Greek leter lambda.
In mathematics, the Levi-Civita symbol.
In mathematics, set membership (often written ∈ instead of ε), especially in older texts.
In physics, the permittivity of a medium.
In automata theory, a transition that involves no shifting of an input symbol.
In astronomy, the fifth brightest (usually) star in a constellation. See Bayer designation.
In phonetics, the open or lax mid-front vowel, as in the English word "pet" (/pεt/)

Epsilon S.A - studio company
GM Epsilon platform, a mid-size car automobile platform from General Motors.
Epsilon Industries Inc. - A plastic injection molding firm specializing in custom molds and new product development.

Epsilon in Malaysian Pale is the name of the second solo album released by Tangerine Dream leader Edgar Froese in 1975.
Epsilon is also an Australian light-powered female-looking robot that fought Pluto in an episode of Astro Boy.
Epsilon Eridani III is the planet that the spacestation Babylon 5 orbited in the eponymous sci-fi television series.
E-104 Epsilon is also the name of a robot in Sonic Adventure.
Epsilon Semi-Moron is the lowest and least intelligent caste in Aldous Huxley's dystopic satire Brave New World.
In Greek it is used for Epsilon Team.
Epsilon is the main character in the John J. Rust superhero novel "Epsilon."