noun which may take the genitive case particle 'no'
confidential; secret; classified
Often used in official or business contexts to mark documents or information as confidential. The term originates from the ㊙ symbol, which is a circled 秘 (secret).
This document is treated as confidential.
Classified information was leaked.
top-secret data; confidential documents
Standard spelling using the circled 秘 symbol (㊙) or its katakana representation. This is the most common written form.
Kanji spelling using 丸 for 'circle'. Less common than マル秘 but still encountered.
From 丸 (まる, 'circle') + 秘 (ひ, 'secret'), referring to the ㊙ symbol used to mark confidential documents.