There are two main types of seal scripts, the Dazhuan (大篆) or Great Seal script, and the Xiaozhuan (小篆) or Small Seal Script.
The Great Seal script is thought to have been systemised during the reign of the Zhou King Xuan) (周宣公) in the form of zhouwen (籒文). They are characterised by vertically elongated characters of a regular appearance.
The Small Seal script was systemised by Li Si during the reign of the First Emperor of China Qin Shi Huangdi. Through Chinese commentaries, it is known that Li Si compiled XiaoZhuan, a list of some 3,000 Chinese characters. Their form is characterised by being less rectangular and more squarish.
