Folio (paper size)

Paper cut on the size of 8½ × 13 inches (216 × 330 mm) It is often referred to as Folio or Foolscap. This was a traditional paper size used in the United Kingdom, named after the fool's cap and bells watermark commonly used at one time, (though it was more usually cut to 8½ × 13½ inches) before the adoption of modern international paper sizes there. Recently it has met more widespread use in some circles in the United States.

In terms of the traditional names for paper sizes, neither Folio nor Foolscape is a strictly accurate term for this size of paper. A foolscap paper sheet is 17 x 13½ inches in size, and a folio sheet of any type is simply half the standard sheet size. So strictly speaking, 8½ × 13½-inch paper is Folio Foolscap. It is not surprising that either half of this name tends to get dropped by people who have no reason to know its origin.

In Brazil that paper size is also sometimes called Ofício II, a reference to the 8½ × 14 inches (216 × 356 mm) paper size (which is named Legal but in Portuguese is better known as Ofício).