bookmarker
nounEtymology From book + marker.
1
A slip of paper, card, etc. used to mark one's place in reading a book; a bookmark.
- “Oh, let us not mention such astronomical figures,” said Bolotov, approaching and replacing with a grass blade the thumb he had been using as a bookmarker.1957 March 7, Vladimir Nabokov, chapter 5.3, in Pnin, Heinemann, page 122: