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2. Trim tab - Wikipedia

   en.wikipedia.org/wiki/Trim_tab

   Typical trim tabs on aileron, rudder and elevator. Trim tabs are small surfaces connected to the trailing edge of a larger control surface on a boat or aircraft, used to control the trim of the controls, i.e. to counteract hydro- or aerodynamic forces and stabilise the boat or aircraft in a particular desired attitude without the need for the operator to constantly apply a control force.

3. Window blind - Wikipedia

   en.wikipedia.org/wiki/Window_blind

   Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

4. Multifoil arch - Wikipedia

   en.wikipedia.org/wiki/Multifoil_arch

   Multifoil arch in the Aljafería, Zaragoza, Spain. A multifoil arch (or polyfoil arch), also known as a cusped arch, [1] [2] polylobed arch, [3] [4] or scalloped arch, [5] is an arch characterized by multiple circular arcs or leaf shapes (called foils, lobes, or cusps) that are cut into its interior profile or intrados.

5. Louver - Wikipedia

   en.wikipedia.org/wiki/Louver

   Modern louvers are often made of aluminum, metal, wood, or glass.They may be opened and closed with a metal lever, pulleys, or through motorized operators. [3]The Australian Standard specifies requirements for the construction of buildings using louver in bushfire-prone areas in order to improve their resistance to bushfire attack from burning embers, radiant heat, flame contact and ...

6. WindowBlinds - Wikipedia

   en.wikipedia.org/wiki/WindowBlinds

   For a short time there was also a scaled-back version of the original Window Blinds called "WBLiteFX", a name which was still present in WindowBlinds registry settings as of May 2006. WindowBlinds (now re-branded as one word) quickly made its way to a 1.0 release, driven by the requests of users to add "freeform skinning" (customizable window ...

7. Scalloped topography - Wikipedia

   en.wikipedia.org/wiki/Scalloped_topography

   Scalloped depressions are thought to begin with a small trigger like a small impact, local darkening, erosion, or cracks from thermal contraction. Cracks are common in ice-rich ground on the Earth. Their model predicts that these scalloped depression will develop when the ground has large amounts of pure ice, up to many tens of meters in depth.