Tei’an Sanjin 貞庵山人 (sinicized Zhēn’ān Shānrén, “Mountain-Man of the Chaste Hermitage”, fl. late 18th c., late Edo Japan), the hào of the collator-publisher who in Kansei 5 guǐchǒu (= 1793, early spring) brought to print the 平井庭石 (Hirai house) manuscript Kohō bunryōkō 古方分量考 (KR3ed102) — a Hàn-to-Japanese measure-conversion handbook for the Zhāng Zhòngjǐng classical formulas. The preface implies that the collator had received the manuscript from the Hirai family circle and that he himself worked within the same Kohō-ha doctrinal tradition. The personal name behind the hào is not securely identified, and no other works are attributed to this signature.