superscribe

To write on the outside or upper part of (a letter, for example).

To write (a name or an address, for example) on the top or outside.

To write or engrave on the top, outside, or surface; inscribe; put an inscription on.

To write the name or address of one on the outside or cover of: as, to superscribe a letter.

To write or engrave (a name, address, inscription, or the like) on the top or surface; to write a name, address, or the like, on the outside or cover of (anything).

to write on the exterior of, the surface of, or above.

to write (something) on the exterior of an object, such as a document or an envelope.

To address (an envelope etc.).

write on the top or outside

write on the outside or upper part of