Folio

Les Très Riches Heures du duc de Berry, folio 39, verso

When talking about manuscripts, and printing in general, a folio is a sheet, which is used on both sides. One of the sides is known as recto, the other one as verso.

Folio Media

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  The title-page of the Shakespeare First Folio, 1623

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  Single folio from a large Qur'an, North Africa, 8th c. (Khalili Collection)

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  The folio: printing, folding and cutting, compared to the quarto and octavo

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  Copy of the Gutenberg Bible, printed in folio format

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  Left-to-right language books (such as English)

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  Right-to-left language books (such as Arabic)