 A page is one side of a leaf of paper. It can be used as a measurement of documenting or recording quantity ("that topic covers twelve pages").
The page in typography
In a book, the page on the left side is called the verso page and the page on the right side is called the recto page. The verso and the recto (the facing pages) together form what is referred to as a spread.
The first page of an English-language book is typically a recto page, and the reader flips the pages from right to left. In right-to-left languages (Arabic, Hebrew, and Persian, plus Chinese and Japanese when written vertically), the first page is verso and the reader flips the pages from left to right.
The process of placing the various text and graphical elements on the page in a visually organized way is called page layout, and the relative lightness or darkness of the page is referred to as its
color.
In book typography, a “typical page” refers to a master design of a page, designed by the graphic designer or the typographer of a book, that illustrates how similar pages in the same book can achieve a level of visual consistency. To help maintain the desired consistency, the typical page may employ a grid system.
In a modern book, a page may contain a header and a footer. Pages may or may not be numbered, but most pages usually are.
The pages appearing before the main text of a book (including the title page, preface, table of contents, etc.) are collectively called the front matter and those appearing after the main text (appendices, colophon, etc.), the back matter. Placement of the copyright page varies between different typographic traditions: in English-language books it belongs to the front matter; however, in Chinese and Japanese, the copyright page is part of the back matter.
In English-language typography, the size of a page is traditionally measured in a unit called the pica.
The page in library science
In library science, the number of pages in a book forms part of its physical description, coded in subfield 300$a in MARC 21 and in subfield 215$a in UNIMARC. This description consists of the number of pages (or a list of such numberings separated by commas, if the book contains separately-numbered sections), followed by the abbreviation “p.” for “page(s)”. The number of pages is written in the same style (Arabic or Roman numerals, uppercase or lowercase, etc.) as the numbering in each section. Unnumbered pages are not described.
For example,
XI, 2050 p.
describes a book with two sections, where section one contains 11 pages numbered using uppercase Roman numerals, and section two contains 2050 pages numbered using Arabic numerals; the total number of pages is thus 2061 pages, plus any unnumbered pages.
If the book contains too many separately-numbered sections, too many unnumbered pages, or only unnumbered pages, the librarian may choose to describe the book as just “1 v.” (one volume) when doing original cataloguing.
The printed page in computing
In word processors and spreadsheets, the process of dividing a document into actual pages of paper is called pagination. Printing a large page on multiple small pages of paper is sometimes called tiling.
In early computing, computer output typically consists of mono-spaced text neatly arranged in equal number of columns and rows on each printed page. Such pages are typically printed using line printers (or, in the case of personal computers, character (usually dot matrix) printers) that accepts a simple code such as ASCII, and the end of a printed page can be indicated by a control character called the form feed.
Page printers, printers that print one page at a time, typically accept page description languages. In the PostScript page description language, the page being described is printed using the "showpage" operator.
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