Zi is monjo (written material) used by lower-ranking government officials equal to or below the rank of Zonin or by the common people or hakucho (inferior servants) when they reported to their superiors, under the ritsuryo system (a system of centralized government based on the ritsuryo code).
辞（じ）とは、律令制において雑任以下の下級官人及び一般庶民（白丁）が、官司に上申する際に用いたとされる文書。