Flyleaf
/ˈflaɪliːf/
Definition 1 of 1
Pro Tip 1/3Author Signatures
Flyleaf is often where authors sign their name in a book, making it a special page for collectors. 
I got my copy personalized with the novelist's signature on the flyleaf.
Pro Tip 2/3Personal Messages
A blank flyleaf can be used for writing a heartfelt note when gifting a book. 
She wrote 'To my dearest friend' on the flyleaf before presenting the book.
Pro Tip 3/3Not for Content
The flyleaf is not typically used by authors for actual book content—it's usually left blank. 
The story started after the flyleaf, which was left intentionally blank.