noun
privy seal; imperial seal
Refers specifically to the seal of the Emperor of Japan, used on official documents. A historical and formal term.
御名御璽は、天皇の国事行為に関する文書に押される。
The privy seal is affixed to documents related to the Emperor's acts in matters of state.
御璽 is a more general term for the imperial seal, but 御名御璽 specifically combines the Emperor's name and seal.
Compound of 御名 (ぎょめい, 'imperial name') and 御璽 (ぎょじ, 'imperial seal'). The exact historical derivation is uncertain, but the term is conventionally associated with the Emperor's seal.