privy seal; imperial seal
Refers specifically to the seal of the Emperor of Japan, used on official documents. A historical and formal term.
The privy seal is affixed to documents related to the Emperor's acts in matters of state.
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.