The clerical script (; Japanese: 隷書体, Reishotai), also formerly chancery script, is an archaic style of Chinese calligraphy which evolved in the Warring States period to the Qin dynasty, was dominant in the Han dynasty, and remained in use through the Wei-Jin periods. Due to its high legibility to modern readers, it is still used for artistic flavor in a variety of functional applications such as headlines, signboards, and advertisements. This legibility stems from the highly rectilinear structure, a feature shared with modern regular script (kaishu). In structure and rectilinearity, it is generally similar to the modern script; however, in contrast with the tall to square modern script, it tends to be square to wide, and often has a pronounced, wavelike flaring of isolated major strokes, especially a dominant rightward or downward diagonal stroke. Some structures are also archaic.