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An obstacle (also called a barrier, impediment, or stumbling block) is an object, thing, action or situation that causes an obstruction. [1] A obstacle blocks or hinders our way forward. Different types of obstacles include physical, economic , biopsychosocial , cultural, political, technological and military.
Abatis: a defensive obstacle consisting of an obstacle formed (in the modern era) of the branches of trees laid in a row. Banquette, or fire step; Barbed wire; Bartizan: a cylindrical turret or sentry post projecting beyond the parapet of a fort or castle; Bastion
The cheval de frise (plural: chevaux de frise [ʃə.vo də fʁiz], "Frisian horses") was a defensive obstacle, existing in a number of forms, principally as a static anti-cavalry obstacle but also quickly movable to close breaches. The term was also applied to underwater constructions used to prevent the passage of ships or other vessels on rivers.
When applied to slides involving obstacles, backside and frontside take on different meaning: the terms define how the obstacle is being approached. For example, when performing a frontside boardslide, "frontside" means that the obstacle (e.g. rail or ledge) is to the front (the toe-side) of the skateboarder.
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 .
References A ace Slang for the drug acepromazine or acetyl promazine (trade names Atravet or Acezine), which is a sedative : 3 commonly used on horses during veterinary treatment, but also illegal in the show ring. Also abbreviated ACP. action The way a horse elevates its legs, knees, hock, and feet. : 3 Also includes how the horse uses its shoulder, humerus, elbow, and stifle; most often used ...
A sketch of a typical concertina wire obstacle Concertina wire can be a feature of prisons. In World War I, barbed wire obstacles were made by stretching lengths of barbed wire between stakes of wood or iron. At its simplest, such a barrier would resemble a fence as might be used for agricultural purposes. [2]
It is often a serious obstacle for mountaineers, who sometimes abbreviate "bergschrund" to "schrund". Bergschrunds extend to the bedrock and can have a depth of well over 100 metres (330 ft). A bergschrund is distinct from a randkluft (also called rimaye ), which is a crevasse with one side formed by rock.