Variant characters are a special writing phenomenon. Since the creation of writing, the phenomenon of variant characters has appeared in the history of writing. Although "different characters" is a concept proposed by later generations, the ancients have already noticed this phenomenon, analyzed and sorted it out many times, and achieved good results, such as "Shu Tongwen" in the Qin Dynasty and "Shuowen" in the Han Dynasty. "Jiezi" and Xiping Shijing both involve the ancients' arrangement of variant characters.
"Collection of Variants Commonly Used in Official Script"
