scratch paper

1. N-UNCOUNT Scratch paper is paper that is used for quick notes, drafts, or sketches. 便箋[美國英語]

The notes were always on scratch paper or the back of an envelope, nothing fancy. 這些筆記總是在便箋或信封背面上，沒什么特別的。

...a piece of scratch paper. ...一張便箋。