History of education
Although there are more than 40,000 Chinese characters in written Chinese, many are rarely used. Studies have shown that full literacy in the Chinese language requires a knowledge of only between three and four thousand characters.
Chinese classifier
Chinese has a large number of nominal classifiers; estimates of the number in Mandarin range from "several dozen" or "about 50", to over 900. The range is so large because some of these estimates include all types of classifiers while others include only count-classifiers, and because the idea of what constitutes a "classifier" has changed over time. Today, regular dictionaries include 120 to 150 classifiers; the 8822-word "Syllabus of Graded Words and Characters for Chinese Proficiency" () lists 81; and a 2009 list compiled by Gao Ming and Barbara Malt includes 126. The number of classifiers that are in everyday, informal use, however, may be lower: linguist Mary Erbaugh has claimed that about two dozen "core classifiers" account for most classifier use. As a whole, though, the classifier system is so complex that specialized classifier dictionaries have been published.