Greek Symbols

Epsilon Symbol

Ε ε ϵ

The epsilon symbol (Ε / ε / ϵ) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the epsilon symbol with one click.

Uppercase Epsilon Symbol (Ε)

Ε
SymbolFormatData
ΕUnicodeU+0395
ΕHTMLΕ
ΕCSS\0395
ΕJavaScript\u0395
E\EpsilonTeX\Epsilon
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Greek Capital Letter Epsilon (Ε)ImageDownload ↓

Also known as: epsilon, uppercase epsilon, big epsilon, greek epsilon, greek e, e greek letter, epsylon.

The Greek capital letter Epsilon (Ε) is visually identical to the Latin capital E and is therefore rarely used as a distinct symbol in mathematical writing. When it does appear, it may label a set or matrix where authors wish to pair it with the lowercase epsilon of the same family. Most mathematical uses of epsilon involve the lowercase form instead.

E={ϵ:0<ϵ<1}\Epsilon = \{ \epsilon : 0 < \epsilon < 1 \}

Lowercase Epsilon Symbol (ε)

ε
SymbolFormatData
εUnicodeU+03B5
εHTML&#x03B5;
εCSS\03b5
εJavaScript\u03B5
ε\varepsilonTeX\varepsilon
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Greek Small Letter Epsilon (ε)ImageDownload ↓

Also known as: varepsilon, greek e, small positive quantity, epsilon delta, curly e, error term symbol, epsylon, greek letter epsilon.

The lowercase Greek letter epsilon ε conventionally denotes a small positive quantity, especially in the epsilon-delta definitions of limits and continuity in analysis. It also appears as an error term, a perturbation parameter, or the empty string in formal language theory. In set theory ∈ derives historically from this letter.

∀ε>0, ∃δ>0\forall \varepsilon > 0,\ \exists \delta > 0

Variant Epsilon Symbol (ϵ)

ϵ
SymbolFormatData
ϵUnicodeU+03F5
ϵHTML&#x03F5;
ϵCSS\03f5
ϵJavaScript\u03F5
ϵ\epsilonTeX\epsilon
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Greek Lunate Epsilon Symbol (ϵ)ImageDownload ↓

Also known as: epsilon symbol, greek epsilon, small epsilon, epsilon variable, arbitrarily small quantity, belongs to variant, crescent epsilon, epsylon, curly epsilon.

The lunate epsilon ϵ is a variant, crescent-shaped form of the Greek lowercase letter epsilon. In analysis it conventionally denotes an arbitrarily small positive quantity, central to the formal definition of limits and continuity. It also appears as the membership symbol in some styles of set notation.

∣x−a∣<ϵ|x - a| < \epsilon

Epsilon Symbol Alt Codes

On Windows, hold Alt and type the code on the numeric keypad, then release Alt. Num Lock must be on.

Alt CodeCaseSymbol
Alt238Lowercaseε

Codes without a leading zero are legacy OEM codes; they depend on a US English Windows code page.

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ε
Epsilon Symbol — Ε Greek Capital Letter Epsilon, ε Greek Small Letter Epsilon, ϵ Greek Lunate Epsilon Symbol