In printing and publishing, any single printed sheet with multiple pages imposed on it. The sheet, once folded and cut, forms a group of pages in their proper numbered sequence, as in a book. Some common signature sizes include quarto, octavo, sixteenmo, and thirty-twomo.

Saddle stitch

The binding of booklets or other printed materials by stapling the pages on the folded spine.

Specifications (specs)

Complete and precisely written description of features of a printing project, such as size, number of pages, type of paper, printing quality, binding method and so on.


The back of a bound book connecting the two covers. Also called backbone.

Spot colour

One ink or varnish applied to portions of a sheet, as compared to flood or painted sheet.