Based on the words of Emperor Tenchi that says 'the law established and promulgated as a permanent code that should not be irreversible,' it is referred as Fukai-no-Joten/ Fukaijoten (Irreversible Permanent Code/ Ireversible Eternal Code) in academic society.
天智天皇が「改めるまじき常の典と定め賜ひ敷き賜ひた法」というくだりから、学界で不改常典と呼ばれる。