a book of or for notes.

a book or binder of blank, often ruled, pages for recording notes, esp. one used by students in class.

a book in which promissory notes are entered, registered, recorded, etc.

a small, lightweight laptop computer.

noun

binder , blotter , daybook , diary , exercise book , journal , log , loose-leaf notebook , memo book , pad , scratch pad , spiral notebook , workbook , record , register