Octavo (usually abbreviated 8vo, 8°, 8o, or Oct. ) is a book size resulting from the use of standard size sheets of paper folded three times to make eight leaves. The size of a specific Book is measured from the head to tail of the spine and from edge to edge across the covers Each leaf is usually printed on each side, so this creates a signature of 16 pages in total. It was introduced by Aldus Manutius of Venice, when he produced Virgil's Opera in the octavo format, in 1501, in order to facilitate portable reading for men of leisure. Aldus Manutius (1449/1450 – February 6, 1515) the Latinized name of Teobaldo Mannucci, sometimes called Aldus Manutius the Elder to distinguish The modern general use of the term refers to books which are between 8" and 10" (20-25 cm) tall, the most common size for modern hardbound books. More specific sizes can be denoted by:

• Foolscap octavo (6¾" by 4¼")
• Crown octavo (7½" by 5")
• Demy octavo (8¾" by 5⅝")
• Royal octavo (10" by 6¼")

See also

• quarto
• folio
• Bookbinding
• Book size

Bookbinding is the process of physically assembling a Book from a number of folded or unfolded sheets of Paper or other material The size of a specific Book is measured from the head to tail of the spine and from edge to edge across the covers

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