Definition & Meaning of "sextodecimo"

What is "sextodecimo"?

Sextodecimo is a book format created by folding a sheet of paper four times, resulting in sixteen leaves or thirty-two pages per sheet. This format produces a small book, with typical dimensions around 4.5 inches by 6.75 inches, which is approximately 115 mm by 170 mm. It is often used for compact books such as novels, religious texts, and pocket-sized publications.