Delta

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[[Image:Greek alphabet {{{letter|alpha-omega}}}.png| 200px|center]]
Greek alphabet
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 other uses, see Delta (disambiguation).

Template:Greekletters

In Modern Greek it is pronounced [[voiced dental fricative|Template:IPA]], (like the th in the English word this) but in the Ancient Greek language, it was pronounced [[voiced dental plosive|Template:IPA]].

A river delta is named after the letter delta because it has roughly the triangular shape of the upper-case delta.

The upper-case letter Δ is used as the symbol for:

• The difference operator, affecting a change or difference between mathematical values:

<math>{y_2-y_1\over x_2-x_1} = {\Delta y \over \Delta x} </math> = the average change of y per unit x

• The Laplace operator:

<math>\Delta f = \frac {\partial^2 f}{(\partial x)^2} + \frac {\partial^2 f}{(\partial y)^2} </math>

• A macroscopic change in the value of a variable in mathematics or science.
• Any of the delta particles in particle physics.

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

• A microscopic change in the value of a variable in mathematics or science.
• An auxiliary function in Calculus used to rigorously define the limit or continuity of a given function.
• The Kronecker delta in mathematics.
• The Dirac delta function in mathematics.
• Deflection in engineering mechanics
• A mark for deletion in proofreading. The usage is said to date back to classical times.als:Δ

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