Rienjo is a document for confirming a divorce that was issued by a husband to his wife (or his wife's father or brother) during the Edo period.
離縁状（りえんじょう）とは、江戸時代に庶民が離婚する際、夫から妻（または妻の父兄）に宛てて交付する、離婚を確認する文書である。