delta

1 a low triangular area where a river divides before entering a larger body of water

2 the 4th letter of the Greek alphabet

Delta most commonly refers to:

• Delta (letter), the letter Δ or δ in the Greek alphabet, also used as a mathematical symbol
• River delta, a landform at the mouth of a river

Delta also has the following meanings:

Abbreviations

• DELTA (ELT), an advanced diploma in English language teaching
• DELTA (taxonomy), the DEscription Language for TAxonomy

Places

Canada

• Delta, British Columbia (the town located immediately south of the Fraser River delta)
  • Delta (provincial electoral district)
  • Delta (electoral district), a federal electoral district

Nigeria

• Delta State, Nigeria

United States

• Delta, Colorado
• Delta, California
• Delta, Iowa
• Delta, Kentucky
• Delta, Louisiana
• Delta, Missouri
• Delta, Ohio
• Delta, Pennsylvania
• Delta, Utah
• Delta, Wisconsin
• Delta Charter Township, Michigan
• Delta County, Colorado
• Delta County, Michigan
• Delta County, Texas

See also: Mississippi Delta (disambiguation)

Science and technology

Astronomy and physics

• Delta baryon, a subatomic particle with spin 3/2
• In Bayer designation, one of the stars in a constellation (e.g., Delta Cygni)
• Delta-v, a term used in astrodynamics for the total 'effort' to change from one space trajectory to another

Aeronautics

• Delta wing
• Delta rocket, a family of launch vehicles
• Delta Formation (Aircraft), a formation flying manoeuvre in the shape of a V

Earth sciences

• Delta switching, the process by which some rivers change their course near their deltas
• River delta, a landform at the mouth of a river
• Tropical Storm Delta (2005)

Mathematics and computer science

• DELTA (VMS), a debugger used in the VMS operating system
• Δ often denotes a difference; δ can represent a small change or amount
• In elementary set theory and Boolean algebras, Δ usually denotes the symmetric difference
• An inverted delta (\nabla), known as del or nabla, is used as a vector differential operator
• Kronecker delta, a function of two variables which is 1 when they are equal
• Dirac delta function, a distribution used as an approximation for a spike function
• Delta encoding, a technique in computer communications and version-control
• In formal fuzzy logic, Δ denotes a unary connective representing the full truth of a proposition (often called Baaz Delta connective)
• Δ indicates a change of state between two before and after state schemas in the Z notation

Mathematical finance

• One of the Greeks used in option and derivatives pricing representing the rate of change of the option price with respect to changes in the underlying price

Medicine

• Single use of Delta (Δ) is an abbreviation for the Diagnosis of a patient
• Double use of Delta (ΔΔ) is an abbreviation for the Differential diagnosis of a patient

Military

• Delta Force, a U.S. Army special force
• Beredskapstroppen, a Norwegian special police forces team
• Delta class submarine, a Soviet / Russian SSBN submarine series (NATO reporting name)

Companies and products

• Delta Air Lines, a major U.S. airline
• Delta (computer), a Russian ZX Spectrum clone
• Delta Dental, an American dental plan system
• Delta Faucet Company, a plumbing fixtures company
• Delta Holding, an import-export, banking, insurance and retail corporation in Serbia
• Delta Hotels, a Canadian hotel chain
• Delta Machinery, a stationary power tools and equipment company
• Delta Motor Corporation, a South African car manufacturer owned by General Motors
• Delta robot, a specialized type of robot
• GM Delta platform, a compact car automobile platform from General Motors
• Ilford Delta, a photographic film
• Lancia Delta, a rally car made by the Italian company Lancia
• Enfield Cables Ltd, a cable manufacturer

Entertainment and fiction

• Delta (album), a 2007 studio album by Delta Goodrem
• Delta-S, an industrial band from Camarillo, California
• Delta (computer game), a 1987 horizontally-scrolling shooter computer game
• Delta (TV series), a 1992 TV series starring Delta Burke
• Delta Halo, Halo Installation #5 in the Halo Universe
• Delta FM, a UK radio station
• Delta Quadrant, a quadrant of the Milky Way Galaxy depicted in Star Trek
• Delta Squad, the player's team in Star Wars: Republic Commando
• Delta, a codename used by Jason Bourne in the fiction series The Bourne Identity
• E-103 Delta, a robot in E-Series (Sonic the Hedgehog)
• R·Type Delta, the fourth R-Type game in the series
• EX Delta Species, a Pokémon Trading Card Game expansion
• Delta Flyer, a shuttle craft in the Star Trek TV series Voyager
• Kamen Rider Delta, a Kamen Rider that appeared in the Japanese TV series Kamen Rider 555
• Space Patrol Delta, a fictional organization from the Power Rangers universe
• The Delta Megazord (shaped like a capital Δ) is a zord in Power Rangers in Space

Miscellanea

• Delta waves, a low level EEG reading associated with sleep
• Delta Works, a flood-protection works in the Netherlands
• A form of tricycle having two wheels in back and one wheel in front
• The refractory section in the roof of an electric arc furnace (EAF) through which one or more electrodes enter
• Delta, a quadra group used in socionics

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