Page header running header or running headline, is a header that appears on each standard page. Running heads do not usually appear on display pages such as title pages, or on other front or back matter. Running heads in a book typically consist of the title on the left-hand (verso) page, and the chapter title on the right-hand (recto) page; or the chapter title on the verso and subsection title/subhead on the recto, aiding the reader's navigation by showing what content exists within the two-page spread at hand. A special case of the latter is in dictionaries, whose running heads are called
Book test corner, which is turned just enough to be visible. A commercial variation of the dictionary test is known as "Flashback," and comes in the form of a complete gimmicked book. Instead of the word appearing faintly at the top of the page, it is arranged so the last word on the left page is the same as the first word on the right page. In some forms the antonym appears on the mirror page, instead of the same word. For instance, if the word "day" appears as the first word on the left page, a straight flashback would put the