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2. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.

3. Carl Prinzler - Wikipedia

   en.wikipedia.org/wiki/Carl_Prinzler

   Carl Jacob Prinzler (June 6, 1870 – May 30, 1949) was an American engineer who invented the "panic bar" device for doors that allowed them to be opened from the inside despite being locked on the outside.

4. Bullbar - Wikipedia

   en.wikipedia.org/wiki/Bullbar

   A bullbar on a Land Rover Discovery fitted with spotlights and a sand flag. Push bar of a police car in Abu Dhabi, used to move stranded vehicles out of the way. A bullbar or push bumper (also kangaroo bar, roo bar, winch bar or nudge bar in Australia, livestock stop [NB 1] or kangaroo device in Russia, and push bar, ram bar, brush guard, grille guard, cactus pusher, rammer, PIT bar, PIT ...

5. Storm door - Wikipedia

   en.wikipedia.org/wiki/Storm_door

   Rollscreen. This is a relatively new hybrid of the full view and ventilating storm doors. The screen is connected at the top of the storm door's window, and when not in use it automatically rolls up on a tensioned dowel in the top of the door. This gives a full-view door when the screen is not in use, and a ventilating door when it is.

6. Screen-door effect - Wikipedia

   en.wikipedia.org/wiki/Screen-door_effect

   The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This effect can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.

7. Liquid-crystal display - Wikipedia

   en.wikipedia.org/wiki/Liquid-crystal_display

   An LCD screen used as a notification panel for travellers. Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, often made of indium tin oxide (ITO) and two polarizing filters (parallel and perpendicular polarizers), the axes of transmission of which are (in most of the cases) perpendicular to each other.