Del, or nabla, is an operator used in mathematics, in particular, in vector calculus, as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes its standard derivative as defined in calculus. When applied to a field (a function defined on a multi-dimensional domain), del may denote the gradient (locally steepest slope) of a scalar field (or sometimes of a vector field, as in the Navier–Stokes equations), the divergence of a vector field, or the curl (rotation) of a vector field, depending on the way it is applied.
Strictly speaking, del is not a specific operator, but rather a convenient mathematical notation for those three operators, that makes many equations easier to write and remember. The del symbol can be interpreted as a vector of partial derivative operators, and its three possible meanings—gradient, divergence, and curl—can be formally viewed as the product with a scalar, dot product, and cross product, respectively, of the del "operator" with the field. These formal products do not necessarily commute with other operators or products.
A deel (Mongolian: дээл [teːɮ]; Buryat: дэгэл) is an item of traditional clothing commonly worn since centuries ago among the Mongols and other nomadic tribes of Central Asia, including various Turkic peoples, and can be made from cotton, silk, wool, or brocade. The deel is still commonly worn by both men and women outside major towns, especially by herders. In urban areas, deels are mostly only worn by elderly people, or on festive occasions. The deel appears similar to a caftan or an old European folded tunic. Deels typically reach to below the wearer's knees and fan out at the bottom and are commonly blue, olive, or burgundy, though there are deels in a variety of other colors.
The deel looks like a large overcoat when not worn. Instead of buttoning together in the middle, the sides are pulled against the wearers body, the right flap close to the body with the left covering. On the right side of the wearer are typically 5 or 6 clasps to hold the top flap in place. There is one clasp below the armpit, three at the shoulder, and either one or two at the neckline.
Del or DEL may refer to:
In computing:
Barricade, from the French barrique (barrel), is any object or structure that creates a barrier or obstacle to control, block passage or force the flow of traffic in the desired direction. Adopted as a military term, a barricade denotes any improvised field fortification, such as on city streets during urban warfare.
Barricades also include temporary traffic barricades designed with the goal of dissuading passage into a protected or hazardous area or large slabs of cement whose goal is to actively prevent forcible passage by a vehicle. Stripes on barricades and panel devices slope downward in the direction traffic must travel.
There are also pedestrian barricades - sometimes called bike rack barricades for their resemblance to a now obsolete form of bicycle stand, or police barriers. They originated in France approximately 50 years ago and are now produced around the world. They were first produced in the U.S. 40 years ago by Friedrichs Mfg for New Orleans's Mardi Gras parades.
Barricades (Hebrew: מיתרסים, Mitrasim) was one of the first documentary films created for Israeli television. It tells the story of two families, one Jewish and the other Palestinian, who both lost children during Israel's War of Independence, known to Palestinians as the Naqba, or "Catastrophe." The film, directed by Ram Loevy, caused considerable controversy when it aired on 1 August 1972. It was the first time that an Arab viewers had a chance to experience the emotional significance of the Holocaust for Jews, and it was also the first time that Israeli Jews had an opportunity to experience the emotional significance of the Naqba to the Palestinian people.
Loevy first came up with the idea behind the documentary in 1968, while studying film in London. As a Hebrew-language broadcaster for the BBC, he had proposed creating a documentary about the social rifts tearing at Israeli society, with one episode focusing on the conflict between Jews and Palestinians. Although the BBC expressed interest in the project, Loevy returned to Israel soon after to help launch Channel 1, the country's first attempt at television broadcasting. He did not, however, abandon the idea, albeit in a more reduced format. Back in Israel, Loevy pitched the idea to the Israel Broadcasting Authority, which agreed to fund the project. At the time, Professor Eliyahu Katz, one of the founders of Israeli television, explained that the idea fulfilled one of the major purposes for which television was brought to Israel: to strengthen ties between the Jewish and Arab residents of the country. Loevy made the film in 1969.