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Delta (letter): Wikis

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From Wikipedia, the free encyclopedia

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
Obsolete letters
Digamma uc lc.svg Digamma Qoppa uc lc.svg Qoppa
San uc lc.svg San Sampi uc lc.svg Sampi
Other characters
Stigma uc lc.svg Stigma Sho uc lc.svg Sho
Heta uc lc.svg Heta

Greek diacritics

Delta (uppercase Δ, lowercase δ; Greek: Δέλτα [ðelta], Dhelta) 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. In the Ancient Greek language, it represented a voiced dental plosive /d/, while in Modern Greek it represents a voiced dental fricative /ð/, hence it is pronounced as "th" in "that" or "this". it is romanised as either "D" or "Dh"

A river delta is so named because its shape approximates the upper-case letter delta (the shape is a triangle).

Contents

The upper-case letter Δ

The upper-case letter Δ can be used to denote

  • Change any type; (in science and engineering fields)
  • Change; e.g. in
{y_2-y_1\over x_2-x_1} = {\Delta y \over \Delta x}, the average change of y per unit x, i.e. the change of y over the change of x
\Delta f = \sum_{i=1}^n {\frac{\partial^2 f}{\partial x_i^2}}
\Delta = b^2 - 4ac\,\!

The lower-case letter δ

The lower-case letter δ can be used to denote

See also

References

  1. ^ ADA.org: Oral Health Topics: Emblem/Insignia of Dentistry
  2. ^ Konglig Datasektionen, Statutes, §2.2 Symbol
  3. ^ [1]
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