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  2. Pica (typography) - Wikipedia

    en.wikipedia.org/wiki/Pica_(typography)

    metric ( SI) units. 4.2333 mm. The pica is a typographic unit of measure corresponding to approximately 6 of an inch, or from 68 to 73 of a foot. One pica is further divided into 12 points . In printing, three pica measures are used: The French pica of 12 Didot points (also called cicero) generally is: 12 × 0.376 = 4.512 mm (0.1776 in).

  3. Album cover - Wikipedia

    en.wikipedia.org/wiki/Album_cover

    An album cover (also referred to as album art) is the front packaging art of a commercially released studio album or other audio recordings. The term can refer to: the printed paperboard covers typically used to package: sets of 10 in (25 cm) and 12 in (30 cm) 78 rpm records. singles and sets of 12 in (30 cm) long-play records.

  4. Circle of confusion - Wikipedia

    en.wikipedia.org/wiki/Circle_of_confusion

    At the ordinary distance of vision, of from twelve to fifteen inches, circles of confusion are seen as points, if the angle subtended by them does not exceed one minute of arc, or roughly, if they do not exceed the 1/100 of an inch in diameter. Numerically, 1/100 inch at 12–15 inches is closer to two minutes of arc.

  5. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    American Wire Gauge ( AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [ 1] The cross-sectional area of each gauge is an important factor for ...

  6. Incircle and excircles - Wikipedia

    en.wikipedia.org/wiki/Incircle_and_excircles

    The center of the incircle is a triangle center called the triangle's incenter. [ 1] An excircle or escribed circle[ 2] of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions of the other two. Every triangle has three distinct excircles, each tangent to one of the triangle's sides.

  7. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    In a feature control frame ( FCF ), the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "diameter" include ⌀, DIA, and D. D. diameter; delta. Abbreviations for "diameter" include ⌀, DIA, and D. For delta usage, see for example "delta notes". DIA[ 2] diameter.

  8. Gyroscope - Wikipedia

    en.wikipedia.org/wiki/Gyroscope

    After the war, the race to miniaturize gyroscopes for guided missiles and weapons navigation systems resulted in the development and manufacturing of so-called midget gyroscopes that weighed less than 3 ounces (85 g) and had a diameter of approximately 1 inch (2.5 cm). Some of these miniaturized gyroscopes could reach a speed of 24,000 ...

  9. File:Simple circle with radii and diameter 01.svg - Wikipedia

    en.wikipedia.org/wiki/File:Simple_circle_with...

    This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You ...