It is expressed with a different set of Chinese characters in "Nihon montoku tenno jitsuroku" (5th national history, covering the years 850-858) and with another different set of Chinese characters in "Irohajirui-sho" (a dictionary written by Tadakane TACHIBANA in the Heian period).
なお『日本文徳天皇実録』には、「学宦院」、『伊呂波字類抄』には「学官院」と表記されている。