superscription; address on an envelope
Refers to the text written on the outside of an envelope or package, such as the recipient's address. Common in postal and formal contexts.
external text; external entry
Used for text or entries that appear outside the main body, such as marginal notes, external references, or supplementary information in documents.
Please write the recipient's address and name neatly on the superscription of the envelope.
In this document, supplementary information is provided in the external text.
Compound of 外 (そと, 'outside') and 書き (かき, 'writing'), from the verb 書く (かく, 'to write').