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  2. Adams Synchronological Chart or Map of History - Wikipedia

    en.wikipedia.org/wiki/Adams_Synchronological...

    Adams Synchronological Chart or Map of History, originally published as Chronological Chart of Ancient, Modern and Biblical History is a wallchart that graphically depicts the history of humanity from 4004 BC to modern times.

  3. Billboard Hot 100 - Wikipedia

    en.wikipedia.org/wiki/Billboard_Hot_100

    Chart rankings are based on sales (physical and digital), online streaming, and radio airplay in the U.S. A new chart is compiled and released online to the public by Billboard's website on Tuesdays but post-dated to the following Saturday, when the printed magazine first reaches newsstands.

  4. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders.

  5. Smith chart - Wikipedia

    en.wikipedia.org/wiki/Smith_chart

    A network analyzer ( HP 8720A) showing a Smith chart. The Smith chart is a mathematical transformation of the two-dimensional Cartesian complex plane. Complex numbers with positive real parts map inside the circle. Those with negative real parts map outside the circle.

  6. Chart - Wikipedia

    en.wikipedia.org/wiki/Chart

    A chart (sometimes known as a graph) is a graphical representation for data visualization, in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart".

  7. International Phonetic Alphabet chart - Wikipedia

    en.wikipedia.org/wiki/International_Phonetic...

    The following is the chart of the International Phonetic Alphabet, a standardized system of phonetic symbols devised and maintained by the International Phonetic Association.