In printing and publishing, any single press sheet on which multiple pages have been imposed which, when folded and cut, forms a group of pages. Most books and other publications are printed as groups of signatures, the multiple imposition allowing a significant reduction in the number of independent pressruns required to print all pages. The number of pages that are imposed on a single signature varies by publication and by press size. Some common signature sizes include broadside, folio, quarto, octavo, sixteenmo, and thirty-twomo. (See Book Typography and Imposition.)

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