also: ちょくひ
noun
personal; confidential (on a letter)
Written on the outside of a letter to indicate it is personal and should be opened only by the addressee. Used in formal or traditional correspondence.
封筒に「直披」と書いてある手紙は、本人以外が開けてはいけない。
A letter marked '直披' on the envelope should not be opened by anyone other than the addressee.
昔の手紙には、よく「直披」や「親展」といった言
In old letters, words like '直披' and '親展' were often used.
親展 also means 'confidential' on a letter, but is more common in modern business mail. 直披 is more traditional and personal.
Compound of 直 (direct, personal) and 披 (open, reveal). The exact historical derivation is uncertain, but the term is conventionally used in formal letter writing.