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2. Printer's key - Wikipedia

   en.wikipedia.org/wiki/Printer's_key

   The printer's key, also known as the number line, is a line of text printed on a book's copyright page (often the verso of the title page, especially in English-language publishing) used to indicate the print run of the particular edition. The convention appears in titles published around the middle of the 20th century; it became common ...

3. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/wiki/1951_USAF_resolution_test...

   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 ...

4. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   Number line. The order of the natural numbers shown on the number line. In elementary mathematics, a number line is a picture of a graduated straight line that serves as visual representation of the real numbers. Every point of a number line is assumed to correspond to a real number, and every real number to a point. [1]

5. LogMAR chart - Wikipedia

   en.wikipedia.org/wiki/LogMAR_chart

   Since there are 5 letters per line, the total score for a line on the LogMAR chart represents a change of 0.1 log units. The formula used in calculating the score is: LogMAR VA = 0.1 + LogMAR value of the best line read – 0.02 X (number of optotypes read) Given that each line has 5 optotypes, the equivalent formula is:

6. Line number - Wikipedia

   en.wikipedia.org/wiki/Line_number

   Line number. In computing, a line number is a method used to specify a particular sequence of characters in a text file. The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incrementing by 1 for each successive line. In the C programming language the line number of ...

7. Slashed zero - Wikipedia

   en.wikipedia.org/wiki/Slashed_zero

   Slashed zero. Display of zero in three typefaces, from top to bottom: slashed zero, dotted zero, plain or open zero. The dotted or slashed zero 0̷ is a representation of the Arabic digit "0" (zero) with a slash or a dot through it. This variant zero glyph is often used to distinguish the digit "zero" ("0") from the Latin script letter "O ...