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2. Retroreflector - Wikipedia

   en.wikipedia.org/wiki/Retroreflector

   A set of three mutually perpendicular reflective surfaces, placed to form the internal corner of a cube, work as a retroreflector. The three corresponding normal vectors of the corner's sides form a basis (x, y, z) in which to represent the direction of an arbitrary incoming ray, [a, b, c].

3. Corner reflector - Wikipedia

   en.wikipedia.org/wiki/Corner_reflector

   A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat reflective surfaces. It reflects waves incident from any direction directly towards the source, but translated. The three intersecting surfaces often have square shapes. Radar corner reflectors made of metal are used to reflect radio waves from ...

4. Tube (container) - Wikipedia

   en.wikipedia.org/wiki/Tube_(container)

   Tube (container) A tube, squeeze tube, or collapsible tube is a collapsible package which can be used for viscous liquids such as toothpaste, artist's paint, adhesive, caulk, & ointments. Basically, a tube is a cylindrical, hollow piece with a round or oval profile, made of plastic, paperboard, aluminum, or other metal.

5. Paper fortune teller - Wikipedia

   en.wikipedia.org/wiki/Paper_fortune_teller

   Paper fortune teller. A fortune teller is a form of origami used in children's games. Parts of the fortune teller are labelled with colors or numbers that serve as options for a player to choose from, and on the inside are eight flaps, each concealing a message. The person operating the fortune teller manipulates the device based on the choices ...

6. Mathematics of paper folding - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_paper_folding

   Mathematics of paper folding. Map folding for a 2×2 grid of squares: there are eight different ways to fold such a map along its creases. The discipline of origami or paper folding has received a considerable amount of mathematical study. Fields of interest include a given paper model's flat-foldability (whether the model can be flattened ...

7. Dyneema Composite Fabric - Wikipedia

   en.wikipedia.org/wiki/Dyneema_Composite_Fabric

   Dyneema Composite Fabric. Dyneema Composite Fabric (DCF), also known as Cuben Fiber (CTF3), is a high-performance non-woven composite material used in high-strength, low-weight applications. It is constructed from a thin sheet of ultra-high-molecular-weight polyethylene (UHMWPE, "Dyneema") laminated between two sheets of polyester. [1][2]