top-secret data; confidential documents
Refers to documents or data marked as highly confidential, often used in business or government contexts.
This file contains confidential documents, so please handle it with care.
機密文書 is a more formal term for classified or secret documents, often used in legal or military contexts, while マル秘資料 is a common term for confidential business or administrative documents.
Standard spelling using the circled マル symbol to indicate 'secret' or 'confidential'.
Alternate spelling using the kanji 丸 instead of the circled マル; less common but still used.
Formed from マル秘, the spoken name of the circled character 秘 (㊙), and 資料 “documents; materials.”