Ceremony for Inheriting the Imperial Regalia and Seals
A formal state ceremony in which the new emperor inherits the imperial regalia (sword and jewel) and the state and privy seals. Part of the Japanese enthronement rites.
The Ceremony for Inheriting the Imperial Regalia and Seals was held as part of the enthronement ceremony.
即位の礼 is the broader enthronement ceremony, while 剣璽等承継の儀 is a specific rite within it where the regalia and seals are handed over.
Compound of 剣璽 (sword and jewel, the imperial regalia), 等 (etc.), 承継 (inheritance), and 儀 (ceremony). The term is a modern official designation for this specific enthronement rite.