noun
papal triple tiara
Refers specifically to the three-tiered crown historically worn by popes, symbolizing the triple authority of the papacy.
バチカン美術館には、かつて教皇が使用した三重冠が展示されている。
The Vatican Museums display a papal triple tiara once used by a pope.
教皇冠 is a broader term for any papal crown, while 三重冠 specifically denotes the triple-tiered tiara.
Compound of 三 (three), 重 (layer), and 冠 (crown), directly describing the three-tiered crown.