noun
Three Palace Sanctuaries
Refers to the three Shinto sanctuaries within the Tokyo Imperial Palace: Kashiko-dokoro (enshrining the sacred mirror), Kōrei-den (enshrining the spirits of past emperors), and Shin-den (enshrining the kami of heaven and earth). Used in formal and historical contexts.
宮中三殿は皇居内にある重要な祭祀施設です。
The Three Palace Sanctuaries are important ritual facilities within the Imperial Palace.
Compound of 宮中 (kyūchū, 'inside the imperial palace') and 三殿 (sanden, 'three shrines/halls'). The term is specific to the Japanese imperial household and has no known alternative origin.