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2. Mirror mount - Wikipedia

   en.wikipedia.org/wiki/Mirror_mount

   The most common type of mirror mount is the kinematic mount. [3] This type of mount is designed according to the principles of kinematic determinacy. Typically, the movable frame that holds the mirror pivots on a ball bearing which is set into a hole in the fixed frame. Ideally, this hole should be trihedral (pyramid-shaped).

3. Segmented mirror - Wikipedia

   en.wikipedia.org/wiki/Segmented_mirror

   Size comparison of primary mirrors. Segmented mirrors are typically hexagonal and arranged in a honeycomb pattern. A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. The segments can be either spherical or asymmetric (if they are part of a larger parabolic reflector [1]).

4. Secondary mirror - Wikipedia

   en.wikipedia.org/wiki/Secondary_mirror

   The secondary mirror assembly of the Keck Telescope and its relationship to the primary mirror. A secondary mirror (or secondary) is the second deflecting or focusing mirror element in a reflecting telescope. Light gathered by the primary mirror is directed towards a focal point typically past the location of the secondary.

5. Sink - Wikipedia

   en.wikipedia.org/wiki/Sink

   A sink/basin in a bathroom Enamel washbowl and jug Sink in Croatian National Theater in Zagreb, Croatia. A sink (also known as basin in the UK) is a bowl-shaped plumbing fixture for washing hands, dishwashing, and other purposes. Sinks have a tap (faucet) that supplies hot and cold water and may include a spray feature

6. Timeline of United States inventions (1890–1945) - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_United_States...

   1907 Curtain rod. A curtain rod or traverse rod is a device used to suspend curtains, usually above windows or along the edges of showers, though also wherever curtains might be used. The flat, telescoping curtain rod was invented by Charles W. Kirsch of Sturgis, Michigan, in 1907. However, they were not in use until the 1920s.

7. Reflection symmetry - Wikipedia

   en.wikipedia.org/wiki/Reflection_symmetry

   In mathematics, reflection symmetry, line symmetry, mirror symmetry, or mirror-image symmetry is symmetry with respect to a reflection. That is, a figure which does not change upon undergoing a reflection has reflectional symmetry. In 2-dimensional space, there is a line/axis of symmetry, in 3-dimensional space, there is a plane of symmetry.