Nine-fold seal script is a very special kind of seal script. It was originally a font popular in the Song Dynasty as the "official seal of the state and dynasty". It was mainly used for seal engraving. Its strokes are folded and stacked evenly
Symmetry. The number of folds for each character depends on the complexity of the strokes, which can be divided into five, six, seven, eight, nine and ten folds. The reason why it is called "Nine Stacks" is because "Nine is the end of the number, so there are many."
Shu seal is an ancient seal calligraphy, one of the eight styles of Qin calligraphy. It was originally written on Shu as a weapon. Shu is an ancient weapon made of bamboo and wood, a wooden staff, two feet long and without an edge. A paragraph note in "Shuowen Jiezi·Xu" states that "the ancient texts recorded the wat, and the martial arts also recorded the records." "殳" refers to the "搢殳" used by military officials in ancient times, just like the "梢篬" used by civil servants. Civilian officials used the "hut" to record events, while military officials also recorded events in "殳". This is called "殳书", one of the seal scripts, so it is called "殳篆".