Headers and Footers (The GNU Troff Manual)

#### 3.2.3 Headers and Footers

Headers and footers occupy the top and bottom of each page, respectively, and contain data like the page number and the article or chapter title. Their appearance is not affected by the running text. Some packages allow for different titles on even- and odd-numbered pages (for printed, bound material).

Headers and footers are together called titles, and comprise three parts: left-aligned, centered, and right-aligned. A ‘`%`’ character appearing anywhere in a title is automatically replaced by the page number. See Page Layout.