Nroff Mode Nroff mode is a mode like Text mode but modified to handle nroff commands present in the text. It differs from Text mode in only a few ways. All nroff command lines are considered paragraph separators, so that filling will never garble the nroff commands.
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An argument is a repeat count. The other feature of Nroff mode is that you can turn on Electric Nroff mode. When the mode is on, each time you use RET to end a line that contains an nroff command that opens a kind of grouping, the matching nroff command to close that grouping is automatically inserted on the following line. For example, if you are at the beginning of a line and type .