The Clerical script (traditional Chinese: 隸書; simplified Chinese: 隶书; pinyin: lìshū) is an archaic style of Chinese calligraphy. The clerical script was first used during the Han dynasty and has lasted up to the present In its development, it departed significantly from the earlier scripts in terms of graphic structures (a process named libian, or "clerical change"), and was characterized by its rectilinearity, a trait shared with the later regular script.