A page header or simply header in typography

Typography

Typography is the art and technique of arranging type in order to make language visible. The arrangement of type involves the selection of typefaces, point size, line length, leading , adjusting the spaces between groups of letters and adjusting the space between pairs of letters...

 is text which is separated from the main body of text and appears at the top of a printed page

Page (paper)

A page is one side of a leaf of paper. It can be used as a measurement of documenting or recording quantity .-The page in typography:...

. Word processing programs

Word processor

A word processor is a computer application used for the production of any sort of printable material....

 usually provide for the creation and maintenance of page headers, which are often the same from page to page, with merely small differences in information, such as page number.

In publishing

Publishing

Publishing is the process of production and dissemination of literature or information—the activity of making information available to the general public...

, the page header (or "pagehead") is often referred to as the running head. Typical running heads in a book might consist of the book title on the left-hand (verso) page, and the chapter title on the right-hand (recto

Recto

The recto and verso are respectively the "front" and "back" sides of a leaf of paper in a bound item such as a codex, book, broadsheet, or pamphlet. In languages written from left to right the recto is the right-hand page and the verso the left-hand page...

) page, or chapter title on the verso and subsection title on the recto.