commonplace book

WordReference Random House Unabridged Dictionary of American English © 2025

com′monplace book′, 

1. a book in which noteworthy quotations, comments, etc., are written.

• 1570–80

Collins Concise English Dictionary © HarperCollins Publishers::

commonplace book noun

1. a notebook in which quotations, poems, remarks, etc, that catch the owner's attention are entered