Seal script is a style of Chinese calligraphy. This ancient style of Chinese writing is still often used in artist's seal (or chop) nowadays.
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 Huang. Through Chinese commentaries, it is known that Li Si compiled Cangjie (蒼頡篇), a non-extant work of character recognition list of some 3,300 Chinese characters in small seal script. Their form is characterised by being less rectangular and more squarish.
The first character dictionary, Shuowen Jiezi 說文解字 (100 AD - 121 AD), shows 9,353 small seal script characters listed under 540 radicals, the lifework of Xu Shen, during the Han Dynasty.
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