What is 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); as, to superscribe a letter called?

superscribe — 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); as, to superscribe a letter. (Webster's 1913.)