Recto and verso

A sheet folded in this manner is known as a folio, a word also used for a book or pamphlet made with this technique.

[3] The terms "recto" and "verso" are also used in the codicology of manuscripts written in right-to-left scripts, like Syriac, Arabic and Hebrew.

The reading order of each folio remains first verso, then recto, regardless of writing direction.

The distinction between recto and verso can be convenient in the annotation of scholarly books, particularly in bilingual edition translations.

The "recto" and "verso" terms can also be employed for the front and back of a one-sheet artwork, particularly in drawing.

[8] This was also very common in e.g. internal company reports in the 20th century, before double-sided printers became commonplace in offices.

Left-to-right language books (e.g. books in Western languages): recto is the front page , verso is the back page. In this picture, the recto page shown is of the following leaf in a book and hence comes next to the verso of the previous leaf.
Right-to-left language books: recto is the front page, verso is the back page ( vertical Chinese, vertical Japanese , Arabic, or Hebrew). In this picture, the recto page shown is of the following leaf in a book and hence comes next to the verso of the previous leaf.
Grandes Heures of Anne of Brittany , f. 189v-190r