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  2. ∆ - Wikipedia

    en.wikipedia.org/wiki/%E2%88%86

    ∆ may refer to: . Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.; Delta (letter) (Δ), a Greek letter also used in mathematics and computer science

  3. Linux kernel version history - Wikipedia

    en.wikipedia.org/wiki/Linux_kernel_version_history

    This article documents the version history of the Linux kernel.. Each major version – identified by the first two numbers of a release version – is designated one of the following levels of support:

  4. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]

  5. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    For example, Engineering F size is 28 in × 40 in or 711 mm × 1,016 mm with ca. 1.4286:1; it is commonly required for NAVFAC drawings, but is generally less commonly used. Engineering G size is 22 + 1 ⁄ 2 in (572 mm) high, but it is a roll format with a variable width up to 90 in (2.3 m) in increments of 8 + 1 ⁄ 2 in (216 mm). Engineering ...

  6. List of countries by GDP (PPP) - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)

    GDP (PPP) means gross domestic product based on purchasing power parity.This article includes a list of countries by their forecast estimated GDP (PPP). [2] Countries are sorted by GDP (PPP) forecast estimates from financial and statistical institutions that calculate using market or government official exchange rates.

  7. 2017 Las Vegas shooting - Wikipedia

    en.wikipedia.org/wiki/2017_Las_Vegas_shooting

    On the morning after the shooting, lines to donate blood in Las Vegas stretched for blocks, and wait times were as much as six hours or more. [86] In Las Vegas alone, 800 units of blood were donated to the local blood bank in the days following the shooting, and the American Red Cross reported a 53% increase in blood donation in the two days ...

  8. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    In motion picture formats, the physical size of the film area between the sprocket perforations determines the image's size. The universal standard (established by William Dickson and Thomas Edison in 1892) is a frame that is four perforations high. The film itself is 35 mm wide (1.38 in), but the area between the perforations is 24.89 mm × 18 ...