After the Taiho Ritsuryo (Taiho Code) was established, it mainly meant the Chokusho such as Chokushi based on Kushiki-ryo (law on state documentary forms in the Yoro Code).
大宝律令の制定後は公式令(律令法)に基づいて出された勅旨などの勅書のことを主に指した。