Written Chinese
Because the majority of modern Chinese words contain more than one character, there are at least two measuring sticks for Chinese literacy: the number of characters known, and the number of words known. John DeFrancis, in the introduction to his "Advanced Chinese Reader", estimates that a typical Chinese college graduate recognizes 4,000 to 5,000 characters, and 40,000 to 60,000 words. Jerry Norman, in "Chinese", places the number of characters somewhat lower, at 3,000 to 4,000. These counts are complicated by the tangled development of Chinese characters. In many cases, a single character came to be written in multiple ways. This development was restrained to an extent by the standardization of the seal script during the Qin dynasty, but soon started again. Although the "Shuowen Jiezi" lists 10,516 characters—9,353 of them unique (some of which may already have been out of use by the time it was compiled) plus 1,163 graphic variants—the "Jiyun" of the Northern Song Dynasty, compiled less than a thousand years later in 1039, contains 53,525 characters, most of them graphic variants.
Chinese name
Because the small number of Chinese surnames leads to confusion in social environments, and because some Chinese parents have a desire to give individuality, some Chinese have received unusual given names. As of April 2009, about 60 million Chinese people have unusual characters in their names. A 2006 report by the Chinese public security bureau stated that of about 55,000 Chinese characters used in the People's Republic of China, only 32,232 of those are supported by the ministry's computers. The PRC government has asked individuals with unusual names to change them so they can get new computer-readable public identity cards, and the diversity prevents them from receiving new identity cards if they do not change their names.