CJK characters
Chinese is written almost exclusively in Chinese characters. It requires over 3,000 characters for general literacy, but up to 40,000 characters for reasonably complete coverage. Japanese uses fewer characters — general literacy in Japanese can be expected with 1,945 characters. The use of Chinese characters in Korea is becoming increasingly rare, although idiosyncratic use of Chinese characters in proper names requires knowledge (and therefore availability) of many more characters. However, even today, students in South Korea are taught 1,800 characters.
Jijiupian
The original "Jijiupian" consisted of 32 sections ("zhang" 章), each with 63 Chinese characters, totaling 2,016. Some later editions of the text add two more sections, each with 64 characters, thus totaling 2,144. The text was designed to include as many different characters as possible, with little repetition, in order to maximize the student's exposure to and learning of new words. The text is described as a sort of abecedarium (Goodrich 1975: 220, Yates 2011: 358).