bookmark
It is a reading label made of paper, electronics, plant leaves and metal.
Used to inscribe the title of a book, usually attached to the upper left corner of the cover of an ancient book, sometimes with the book number, the name of the inscriber and the reading place. A bookmark is a small piece of paper sandwiched in a book to record the progress of reading. With the development of the Internet era, electronic tags are derived to record reading progress and experience.