Some info about LATIN
Category
QUOTES AND PHRASES
The size of a book is generally measured by the height against the width of a leaf, or sometimes the height and width of its cover.[2] A series of terms is commonly used by libraries and publishers for the general sizes of modern books, ranging from folio , each leaf one fourth the size of the original sheet printed – note that a leaf refers to the single piece of paper, whereas a page is one side of a leaf. Because the actual format of many modern books cannot be determined from examination of the books, bibliographers may not use these terms in scholarly descriptions.
Wikipedia contributors, "In folio," Wikipedia, The Free Encyclopedia,
ABOUT THE LATIN LANGUAGE