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.
Naming laws in the People's Republic of China
Latin characters, numerals and other non-Chinese symbols are prohibited, as they do not constitute part of a Chinese name under government law. Only Chinese characters are permitted; however, characters which are unable to be input on computers are also disallowed. There are no limits on the number of characters used, as this may vary depending on the name (typical Chinese names on average constitute 2 to 3 characters, with 4 or more characters being rare; however, non-Han ethnic groups such as Mongols, Tibetans and Uighurs have many syllables after transliteration into Standard Chinese).