Delta (letter)

From Biocrawler, the free encyclopedia.

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 Sigma
Τ τ Tau	Υ υ Upsilon
Φ φ Phi	Χ χ Chi
Ψ ψ Psi	Ω ω Omega
obsolete letters
Ϝ ϝ Digamma	Ϻ ϻ San
Ϙ ϙ Qoppa	Ϡ ϡ Sampi

Delta (upper case Δ, lower case δ) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4.

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:

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

Deltas are the second lowest caste in Aldous Huxley's dystopic satire Brave New World.

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

• A microscopic change in the value of a variable in mathematics or science.
• The Kronecker delta in mathematics.
• The Dirac delta function in mathematics.
• A mark for deletion in proofreading. The usage is said to date back to classical times.

Letters that arose from Delta include the Roman D and the Cyrillic letter De.

da:Deltael:Δ eo:Delto es:Delta fr:Δ ja:Δ it:Delta la:Delta nl:Delta (letter) pl:Delta pt:Delta sv:Delta

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Delta_(letter) (http://en.wikipedia.org/wiki/Delta_(letter)) version history (http://en.wikipedia.org/w/index.php?title=Delta_(letter)&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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