gathering![click to hear](/images/speaker.jpg)
Process by which signatures are assembled together, in particular by adding endpapers.
sheet ![click to hear](/images/speaker.jpg)
Front and back of each sheet in a book signature.
endpaper ![click to hear](/images/speaker.jpg)
Sheet that is folded in half and glued inside the front and back boards to protect the first and last printed pages.
signature ![click to hear](/images/speaker.jpg)
Sheet that is printed and folded to make up a section of a book; it is meant to be combined with other signatures.
bone folder ![click to hear](/images/speaker.jpg)
Very thin blade made from bone or wood; it is used to fold and glue sheets together and to work the bookbinding leather.