Code of Civil Procedure Article 117

Parities or their advocates shall sign their names or impress their seals on the pleadings. Where fingerprints are impressed instead of seals, the parties shall cause another person to write their full names for them, indicate the reason for this approach, and sign his/her own name.
中文原文 民事訴訟法第117條
當事人或代理人應於書狀內簽名或蓋章。
其以指印代簽名者,應由他人代書姓名,記明其事由並簽名。

English translation for reference only; the Chinese text prevails. Not legal advice.