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2. Folding door - Wikipedia

   en.wikipedia.org/wiki/Folding_door

   A folding door is a type of door which opens by folding back in sections or so-called panels. Folding doors are also known as 'bi-fold doors', in spite of them most often having more than two panels. Another term is 'concertina' doors, inspired by the musical instrument of the same name.

3. Orihon - Wikipedia

   en.wikipedia.org/wiki/Orihon

   Orihon consist of a long strip of paper with writing on one side that is then compacted by folding in zig-zag fashion. The orihon format is considered a step between a scroll and a codex . The style of folding is similar to that of the air bellows of a concertina or accordion , such that every written page faces another written page when the ...

4. Oak Ridge gatehouses - Wikipedia

   en.wikipedia.org/wiki/Oak_Ridge_gatehouses

   One of the World War II security gates used when access to the entire city was restricted. The three gatehouses were built c. 1948-1949 and went into service on March 19, 1949, when the residential and commercial portion of Oak Ridge, known as the "townsite," was opened to public access.

5. Folded leaflet - Wikipedia

   en.wikipedia.org/wiki/Folded_leaflet

   A concertina fold, also known as a zig-zag fold, accordion fold or z-fold, is a continuous parallel folding of brochures and similar printed material in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds. Because they do not nest (as in Letter Folds) panels can be the same size.

6. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.

7. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   In North America, the Door and Access Systems Manufacturing Association (DASMA) defines high-performance doors as non-residential powered doors characterized by rolling, folding, sliding or swinging action, that are either high-cycle (minimum 100 cycles/day) or high-speed (minimum 20 inches (508 mm)/second), and two out of three of the ...