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A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (Δ). Although long studied, it did not find significant applications until the Jet Age , when it proved suitable for high-speed subsonic and supersonic flight. [ 1 ]
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 four. It was derived from the Phoenician letter dalet 𐤃. [ 3 ]
The deltahedron is named by Martyn Cundy, after the Greek capital letter delta resembling a triangular shape Δ. [1] The deltahedron can be categorized by the property of convexity. The simplest convex deltahedron is the regular tetrahedron, a pyramid with four equilateral triangles.
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]
The Ganges Delta has the shape of a triangle and is considered to be "arcuate" (arc-shaped). It covers more than 105,000 km 2 (41,000 sq mi) and lies mostly in Bangladesh and India, with rivers from Bhutan , Tibet , and Nepal draining into it from the north. 67% of the delta is inside Bangladesh and only 33% belongs to West Bengal.
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.
Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle. Delta (letter) (Δ), a Greek letter also used in mathematics and computer science; Delta baryon (Δ), one of several Baryons consisting of up and down quarks. alt-J (Δ), a British indie band; Laplace operator (Δ), a ...
Refractory delta, in the roof of an electric arc furnace; Delta baryon, a subatomic particle; Delta circuit, in three-phase electric power; Delta robot, a delta-shaped parallel robot; Ilford Delta, a photographic film; Depleted Lean-channel Transistor, the first type of fin field-effect transistor