Bookplate
/ˈbʊkpleɪt/
Definition 1 of 1
Pro Tip 1/3Identity Marker
A bookplate indicates that a book is part of someone's personal collection, like a small label of ownership. 
When browsing his shelves, I noticed a bookplate with his initials inside every novel.
Pro Tip 2/3Personal Touch
Bookplates often reflect the owner's personality or interests through their design. 
The bookplate showed a quaint drawing of a cat, which hinted at her love for felines.
Pro Tip 3/3Antiquarian Flair
Bookplates can give a book an antique or classic feel, especially if they are ornate or traditional in style. 
His book's bookplate bore an intricate family crest, adding a sense of history.