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  2. Regular icosahedron - Wikipedia

    en.wikipedia.org/wiki/Regular_icosahedron

    In geometry, the regular icosahedron [1] (or simply icosahedron) is a convex polyhedron that can be constructed from pentagonal antiprism by attaching two pentagonal pyramids with regular faces to each of its pentagonal faces, or by putting points onto the cube. The resulting polyhedron has 20 equilateral triangles as its faces, 30 edges, and ...

  3. Color code - Wikipedia

    en.wikipedia.org/wiki/Color_code

    25-pair color code chart used in certain kinds of wiring. A color code is a system for encoding and representing non-color information with colors to facilitate communication. This information tends to be categorical (representing unordered/qualitative categories) though may also be sequential (representing an ordered/quantitative variable).

  4. CIELAB color space - Wikipedia

    en.wikipedia.org/wiki/CIELAB_color_space

    The CIELAB color space, also referred to as L*a*b*, is a color space defined by the International Commission on Illumination (abbreviated CIE) in 1976. [a] It expresses color as three values: L* for perceptual lightness and a* and b* for the four unique colors of human vision: red, green, blue and yellow. CIELAB was intended as a perceptually ...

  5. Azimuth - Wikipedia

    en.wikipedia.org/wiki/Azimuth

    The azimuth is the angle formed between a reference direction (in this example north) and a line from the observer to a point of interest projected on the same plane as the reference direction orthogonal to the zenith. An azimuth ( / ˈæzəməθ / ⓘ; from Arabic: اَلسُّمُوت, romanized : as-sumūt, lit. 'the directions') [1] is the ...

  6. Homeland Security Advisory System - Wikipedia

    en.wikipedia.org/wiki/Homeland_Security_Advisory...

    Homeland Security Advisory System. In the United States, the Homeland Security Advisory System (HSAS) was a color-coded terrorism threat advisory scale created in March 2002 under the Bush administration in response to the September 11 attacks. The different levels triggered specific actions by federal agencies and state and local governments ...

  7. Incenter - Wikipedia

    en.wikipedia.org/wiki/Incenter

    Incenter. The point of intersection of angle bisectors of the 3 angles of triangle ABC is the incenter (denoted by I). The incircle (whose center is I) touches each side of the triangle. In geometry, the incenter of a triangle is a triangle center, a point defined for any triangle in a way that is independent of the triangle's placement or scale.

  8. Charts on SO (3) - Wikipedia

    en.wikipedia.org/wiki/Charts_on_SO(3)

    Charts on SO (3) For broader coverage of this topic, see Rotation group SO (3). In mathematics, the special orthogonal group in three dimensions, otherwise known as the rotation group SO (3), is a naturally occurring example of a manifold. The various charts on SO (3) set up rival coordinate systems: in this case there cannot be said to be a ...

  9. Braiding machine - Wikipedia

    en.wikipedia.org/wiki/Braiding_machine

    This produces a flat, 3-strand braid. A braiding machine is a device that interlaces three or more strands of yarn or wire to create a variety of materials, including rope, reinforced hose, covered power cords, and some types of lace. [1] [2] Braiding materials include natural and synthetic yarns, metal wires, leather tapes, and others.

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