Delta (letter)

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Delta uc lc.svg
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
  • Digamma
  • Heta
  • San
  • Koppa
  • Sampi
  • Tsan
Numerals
ϛ (6)
ϟ (90)
ϡ (900)
In other languages
Scientific symbols

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Delta (uppercase Δ, lowercase δ or 𝛿; Δέλτα{{#invoke:Category handler|main}} Délta; Modern Greek Template:IPA-el) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet Phoenician daleth.png. Letters that come from delta include Latin D and Cyrillic Д.

A river delta (originally, the Nile River delta) is so named because its shape approximates the upper-case letter delta (the shape is a triangle). Despite a popular legend, this use of the word delta was not coined by Herodotus.[1]

Pronunciation

In Ancient Greek, delta represented a voiced dental plosive /d/. In Modern Greek, it represents a voiced dental fricative /ð/, like the "th" in "that" or "this". It is romanized as d or dh.

Upper case

The upper-case letter Δ can be used to denote:

  • Change of any changeable quantity, in mathematics and the sciences (more specifically, the difference operator{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B=

{{#invoke:Category handler|main}}{{#invoke:Category handler|main}}[citation needed] }}); for example, in:

the average change of y per unit x (i.e. the change of y over the change of x). Delta is the initial letter of the Greek word διαφορά diaphorá, "difference". (The small Latin letter d is used in much the same way for the notation of derivatives and differentials, which also describe change.)

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Lower case

The alphabet on a black figure vessel, with a D-shaped delta.

The lower-case letter δ (or 𝛿) can be used to denote:

Meteorology

Keyboard Entry

On Microsoft Windows, a small delta can be generated by typing Template:Key pressTemplate:Key pressTemplate:Key press.

In certain programs (e.g. Microsoft Word), an uppercase delta can be typed using Template:Key pressTemplate:Key pressTemplate:Key pressTemplate:Key press. However, in most other programs, Template:Key pressTemplate:Key pressTemplate:Key pressTemplate:Key press generates a closing quotation mark (”).

Computer encodings

  • Greek Delta / Coptic Dalda

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  • Latin Delta

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  • Technical and Mathematical symbols

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  • Mathematical Delta

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These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.

See also

References