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2. Eye chart - Wikipedia

   en.wikipedia.org/wiki/Eye_chart

   Lea test. logMAR chart. An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [1] Eye charts are often used by health care professionals, such as optometrists, physicians and nurses, to screen persons for vision impairment.

3. Sütterlin - Wikipedia

   en.wikipedia.org/wiki/Sütterlin

   Sütterlin is based on older German handwriting, which is a handwriting form of the Blackletter scripts such as Fraktur or Schwabacher, the German print scripts which were used during the same time. It includes the long s (ſ) , as well as several standard ligatures such as ff (f-f), ſt (ſ-t), st (s-t), and ß (ſ-z or ſ-s).

4. NATO phonetic alphabet - Wikipedia

   en.wikipedia.org/wiki/NATO_phonetic_alphabet

   The (International) Radiotelephony Spelling Alphabet, commonly known as the NATO phonetic alphabet, is the most widely used set of clear-code words for communicating the letters of the Roman alphabet. Technically a radiotelephonic spelling alphabet, it goes by various names, including NATO spelling alphabet, ICAO phonetic alphabet and ICAO ...

5. Landolt C - Wikipedia

   en.wikipedia.org/wiki/Landolt_C

   The Landolt C, also known as a Landolt ring, Landolt broken ring, or Japanese vision test, is an optotype: a standardized symbol used for testing vision. It was developed by the Swiss-born ophthalmologist Edmund Landolt . The Landolt C consists of a ring that has a gap, thus looking similar to the letter C. The gap can be at various positions ...

6. Genealogical numbering systems - Wikipedia

   en.wikipedia.org/wiki/Genealogical_numbering_systems

   The Henry System is a descending system created by Reginald Buchanan Henry for a genealogy of the families of the presidents of the United States that he wrote in 1935. [3] It can be organized either by generation or not. The system begins with 1. The oldest child becomes 11, the next child is 12, and so on.

7. Greek alphabet - Wikipedia

   en.wikipedia.org/wiki/Greek_alphabet

   This writing system, unrelated to the Greek alphabet, last appeared in the thirteenth century BC. In the late ninth century BC or early eighth century BC, the Greek alphabet emerged. [2] The period between the use of the two writing systems, during which no Greek texts are attested, is known as the Greek Dark Ages.