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2. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

3. ColorChecker - Wikipedia

   en.wikipedia.org/wiki/ColorChecker

   ColorChecker. The ColorChecker Color Rendition Chart (often referred to by its original name, the Macbeth ColorChecker[ 1] or simply Macbeth chart[ 2]) is a color calibration target consisting of a cardboard-framed arrangement of 24 squares of painted samples. The ColorChecker was introduced in a 1976 paper by McCamy, Marcus, and Davidson in ...

4. 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 symbolsdevised and maintained by the International Phonetic Association. It is not a complete list of all possible speech sounds in the world's languages, only those about which stand-alone articles exist in this encyclopedia.

5. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/.../1951_USAF_resolution_test_chart

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

6. International Phonetic Alphabet chart for English dialects

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

   The International Phonetic Alphabet chart for English dialects complies all the most common applications of the International Phonetic Alphabet (IPA) to represent pronunciations of the English language . These charts give a diaphoneme for each sound, followed by its realization in different dialects. The symbols for the diaphonemes are given in ...

7. Vowel diagram - Wikipedia

   en.wikipedia.org/wiki/Vowel_diagram

   A vowel diagram or vowel chart is a schematic arrangement of the vowels. Depending on the particular language being discussed, it can take the form of a triangle or a quadrilateral. Vertical position on the diagram denotes the vowel closeness, with close vowels at the top of the diagram, and horizontal position denotes the vowel backness, with ...

8. Nautical chart - Wikipedia

   en.wikipedia.org/wiki/Nautical_chart

   A nautical chart or hydrographic chart is a graphic representation of a sea region or water body and adjacent coasts or banks. Depending on the scale of the chart, it may show depths of water ( bathymetry) and heights of land ( topography ), natural features of the seabed, details of the coastline, navigational hazards, locations of natural and ...

9. Lists of Billboard number-one singles - Wikipedia

   en.wikipedia.org/wiki/Lists_of_Billboard_number...

   Lists of. Billboard. number-one singles. This is a list of songs that have peaked at number one on the Billboard Hot 100 and the magazine's national singles charts that preceded it. Introduced in 1958, the Hot 100 is the pre-eminent singles chart in the United States, currently monitoring the most popular singles in terms of popular radio play ...