Paper size is a term used to describe the dimensions of a sheet of paper. Octavo, ATLAS, LEGAL, foolscap, quarto, demy, TABLOID, IMPERIAL, EMPEROR, and ROYAL are all terms used to describe different paper sizes. Octavo is a size of paper that is six letters long, ATLAS is five letters long, LEGAL is five letters long, foolscap is eight letters long, quarto is six letters long, demy is four letters long, TABLOID is seven letters long, IMPERIAL is eight letters long, EMPEROR is seven letters long, and ROYAL is five letters long. The smallest paper size is pott, which is four letters long.