The handout a character is handed most often is a single page carrying somebody else's words: a letter from a relative who has stopped writing sensibly, a warning left on a table, a transmission that arrived on the wrong channel.
A heading, the message and a signature. Everything that makes it a letter rather than a printout is the skin: Letter is a hand on good paper, Typewriter is a struck ribbon on a thin sheet, Terminal is monospaced text on a screen that logged it, Modern is a printed memo, Diary is a page out of a journal, and Notebook page is a pocket-notebook leaf torn off and pinned up. The body text fits itself to the page, so a long letter stays one page instead of becoming two.
A5, 148 × 210 mm, at 300 DPI. When the words arrived by wire rather than by hand, the Telegram is the same idea on an office blank; when they came from an institution, use the Official Form.