- Delta (letter)
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
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Ligatures (ϛ, ȣ, ϗ) · Diacritics Numerals: (6) · (90) · (900) In other languages Bactrian · Coptic · Albanian Scientific symbols
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Delta (uppercase Δ, lowercase δ; δέλτα; Modern Greek [ˈðelta] dhélta) 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. 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).
Mathematics and the Sciences
The upper-case letter Δ can be used to denote
- Change of any variable quantity, in mathematics and the sciences; for example, in
- , the average change of y per unit x, i.e. the change of y over the change of x
- A macroscopic change in the value of a variable in mathematics or science
- Uncertainty in a physical variable as seen in for instance the uncertainty principle
- An interval of possible values for a given quantity for instance across a sample
- Any of the delta particles in particle physics
- The determinant of the matrix of coefficients of a set of linear equations (see Cramer's Rule)
- That an associated locant number represents the location of a covalent bond in an organic compound, the position of which is variant between isomeric forms
- In chemistry, it is often used to represent the addition of heat in a reaction.
- In legal shorthand, it represents a defendant
- In the financial markets, it is one of the Greeks that describes the rate of change of an option price for a given change in the underlying benchmark
- It is the symbol of the Greek inventor and architect Daedalus
- In genetics, it can stand for a gene deletion, e.g. the CCR5-Δ32 a deletion of the CCR5 at the 32nd base pair segment
- The American Dental Association cites it (together with omicron for "odont") as the symbol of dentistry.
The lower-case letter δ can be used to denote
- An infinitesimal change in the value of a variable in infinitesimal calculus
- 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
- The transition function in automata
- Deflection in engineering mechanics
- The Force of Interest in actuarial science
- The chemical shift of Nuclear Magnetic Resonance in chemistry
- The relative electronegativity of different atoms in a molecule, δ− being more electronegative than δ+
- Text requiring deletion in proofreading. The usage is said to date back to classical times
- In some of the manuscripts written by Dr. John Dee, the character of delta is used to represent Dee
- The Computer Science chapter at the Royal Institute of Technology
- Is a subunit of the F1 sector of the F-ATPase
- The declination of an object in the equatorial coordinate system of astronomy
- The dividend yield on the Black-Scholes option pricing formula
- Signifies a major seventh chord in jazz music notation.
- Ratios of environmental isotopes, such as 18O/16O and D/1H from waters are displayed using delta notation - δ18O and δD, respectively
- The rate of depreciation of the aggregate capital stock of an economy in an exogenous growth model in macroeconomics.
- The name Delta was used as a name during the 1972 Atlantic hurricane season and the 2005 Atlantic hurricane season as Tropical Storm Delta (2005).
- D, d
- Д, д
- Th (digraph)
- Greek letters used in mathematics, science, and engineering
- Nabla symbol ()
- ∂ - the partial derivative symbol, sometimes mistaken for a lowercase Greek letter Delta.
- ẟ - Latin delta
- ^ http://ocw.mit.edu/high-school/courses/highlights-of-calculus/big-picture-of-calculus/
- ^ ADA.org: Oral Health Topics: Emblem/Insignia of Dentistry[dead link]
- ^ "Konglig Datasektionen, Statutes, §2.2 Symbol". D.kth.se. http://www.d.kth.se/sektionen/formalia/stadgar/#paragraf2.2. Retrieved 2010-09-07.
- ^ [dead link]
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