post office box; P.O. box
Abbreviation of 郵便私書箱. Used for a private mailbox rented at a post office.
See also: 郵便私書箱
To open a P.O. box, you need to apply at the post office.
請求書は私書箱宛てに送ってください。
Please send the invoice to my P.O. box.
I rented a P.O. box at the post office for work.
Please send the documents to P.O. Box No. 123.
I had them send the samples to my P.O. box.