〒 is the service mark of Japan Post and its successor, Japan Post Holdings, the postal operator in Japan. It is also used as a Japanese postal code mark since the introduction of the latter in 1968. Historically, it was used by the Ministry of Communications , which operated the postal service. The mark is a stylized katakana syllable te (テ), from the word teishin . The mark was introduced on February 8, 1887.

A post box, also known as a collection box, mailbox, letter box or drop box, is a physical box into which members of the public can deposit outgoing mail intended for collection by the agents of a country's postal service. The term post box can also refer to a private letter box for incoming mail.