noun
imperial couple dolls; emperor and empress dolls
Refers specifically to the pair of dolls representing the emperor and empress displayed on the top tier of the Hina-matsuri doll set.
ひな祭りには、内裏雛を一番上の段に飾ります。
For the Doll Festival, we display the imperial couple dolls on the top tier.
内裏 (だいり) originally referred to the imperial palace, and 雛 (ひな) means doll. The term thus denotes dolls representing the imperial couple.