Delta (letter)
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| 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 | |
| [[Digamma|Template:Polytonic Digamma]] | [[San (letter)|Template:Polytonic San]] |
| [[Qoppa|Template:Polytonic Qoppa]] | [[Sampi|Template:Polytonic 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:Delta de:Delta el:Δ eo:Delto es:Delta fr:Δ ja:Δ it:Delta la:Delta nl:Delta (letter) pl:Delta pt:Delta sv:Delta