g. ) is called the header. It is printed in the header area.
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The text printed at the top of every page (e.g. a page number, date, etc.) is called the header. It is printed in the header area.
The text printed at the bottom of every page (e.g. a page number, chapter number, date, etc.) is called the footer. It is printed in the footer area.
On the left, if there is extra blank space reserved for binding, it is called the "gutter."