It was used when words such as the following appeared in a document: 'The founders of the Imperial family,' 'the former emperor,' 'the son of Heaven,' 'emperor,' 'Your Imperial Majesty,' 'the retired Emperor,' and the posthumous titles of the emperor or the Three Empresses (empress consort, empress dowager and grand empress dowager).
「皇祖」「先帝」「天子」「天皇」「皇帝」「陛下」「至尊」「太上天皇」、天皇諡、三后（皇后・皇太后・太皇太后）などの語に対して用いた。