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.
General Chinese
The result is a syllabary of 2082 syllables, about 80% of which are single morphemes—that is, in 80% of cases there is no difference between GC and standard written Chinese, and in running text, that figure rises to 90–95%, as the most common morphemes tend to be uniquely identified. For example, "kai" can only mean 開 "kāi" 'open', and "sam" can only mean 三 "sān" 'three'. Chao notes, "These syllables then are morphemes, or words with definite meanings, or clusters of meanings related by extensions. About 20 percent of the syllables are homophones under each of which there will be more than one morpheme, [which are traditionally] usually written with different characters [...] The degree of homophony is so low that it will be possible to write text either in literary or colloquial Chinese with the same character for each syllable [...] as has been tested in texts of various styles." Chao compares General Chinese to how Chinese was written when the writing system was still productive: "This amounts to a 100 percent use of writing Chinese by 'phonetic loan' [...] The situation is that when the ancients wrote a character by sound regardless of meaning, it was a 'loan character', whereas if a modern schoolboy writes one, he is punished for writing the wrong character!"