Folium

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Folium (from Latin folium "sheet", plural folia ) is the common name in codicology (science of ancient and medieval books) for a sheet of parchment or paper in a codex .

Until well into the 16th century, it was customary to count the pages rather than the pages in books and to provide page numbers mostly on the upper edge. This type of numbering is called foliation , in contrast to pagination for page counting. The ablative folio ("on sheet"), abbreviated f. or fol. , is therefore still common today in all sciences that deal with ancient texts instead of a page reference: f. 26 r (read: folio 26 recto ) means "on the front of sheet 26", f. 26 v (folio 26 verso ) means "on the back of sheet 26". This count is still used today for the Talmud and for administrative and court records.

Folio (2 °) is accordingly the name of a historical sheet and book format (height approx. 40–45 cm, width approx. 30 cm, corresponds to today's A3 format ). It was created in early letterpress printing by folding the sheets of paper once.

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