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Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet.In the system of Greek numerals it has a value of 4.
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In chemistry, a delta bond (δ bond) is a covalent chemical bond, in which four lobes of an atomic orbital on one atom overlap four lobes of an atomic orbital on another atom. This overlap leads to the formation of a bonding molecular orbital with two nodal planes which contain the internuclear axis and go through both atoms.
A river delta is so named because the shape of the Nile Delta approximates the triangular uppercase Greek letter delta.The triangular shape of the Nile Delta was known to audiences of classical Athenian drama; the tragedy Prometheus Bound by Aeschylus refers to it as the "triangular Nilotic land", though not as a "delta". [8]
Delta Force's founder Charles Beckwith in 1980 Delta Force bodyguards in civilian clothing providing close protection to General Norman Schwarzkopf during the Gulf War, 1991. Delta Force was created in 1977 after numerous well-publicized terrorist incidents led the U.S. government to develop a full-time counter-terrorism unit.
The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
Delta Faucet Company [1] is an American manufacturer of plumbing fixtures and plumbing materials. It is a subsidiary of Masco Corporation . It manufactures and markets faucets , kitchen sinks , bath/shower fixtures, and toilets under the Delta, Kraus, Peerless, and Brizo [ 2 ] brand names.
A delta ray is a secondary electron with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization. [ 1 ] : 25 The term is sometimes used to describe any recoil particle caused by secondary ionization .