Octavo

Octavo has more than one meaning:

In bookbinding and publishing, octavo indicates the book size which results when eight leaves of the book are created from a standard size sheet of paper. Each leaf is usually printed on each side, so this creates a signature of 16 printed (or intentionally blank) pages in total. In modern common usage, an octavo size book is 8-10" tall, which is the most common size for modern hardbound books. Often abbreviated as 8vo, 8° or 8o. 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.
The Octavo is a grimoire in the Discworld series by Terry Pratchett

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