notebook; memo book; record book
A personal notebook for keeping records, notes, or copies of documents; often used in business or personal organization.
I wrote down the meeting details in my notebook.
Compound of 控え (ひかえ, 'note, copy, record') + 帳 (ちょう, 'book, register'). The exact historical derivation is uncertain, but the word has been used since at least the Edo period for personal record books.