Shuowen Jiezi, the earliest systematic Chinese character dictionary, compiled by Xu Shen 许慎[xǔ shèn] in the Eastern Han dynasty (2nd century), containing 10,516 entries
1.(orthography) consistent words (e.g. "dean", "bean", and "lean", where "-ean" is pronounced the same in each case)2.consistent characters (e.g. 摇[yáo], 遥[yáo] and 谣[yáo], which share a phonetic component that reliably indicates that the pronunciation of the character is yáo)