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.
Lin Yutang's Chinese-English Dictionary of Modern Usage
A team of scholars at the Chinese University of Hong Kong Research Centre for Humanities Computing developed a free web edition of "Lin Yutang's Chinese-English Dictionary of Modern Usage" and published it online in 1999. The web edition comprises a total of 8,169 head characters, 40,379 entries of Chinese words or phrases, and 44,407 explanatory entries of grammatical usage. Chinese character encoding is in the Big5 system (which includes 13,053 traditional Chinese characters), which does not encode simplified Chinese characters or uncommon characters (represented as "□" in the dictionary) included in Unicode's 80,388 CJK Unified Ideographs. The web edition dictionary replaces Lin Yutang's obsolete Gwoyeu Romatzyh system with modern standard pinyin romanization, which users can hear pronounced through speech synthesis. It also abandons Lin's obsolete Instant Index System, which "has not been widely used since its inception", and provides three machine-generated indexes by radical, pinyin, and English.