spomenar

1. (children's notebook for friends' entries) friendship book; autograph book
   U osnovnoj školi svi smo imali spomenar. — In primary school we all had a friendship book.
   Napiši mi nešto lepo u spomenar. — Write something nice in my friendship book.

Usually refers specifically to the children's friendship book; it is occasionally used loosely for any keepsake album, but an album of photos is normally called album.