It is conventionally invoked using the driver script pod2man , but it can also be used directly. See below for details. This generally only matters for troff output for printing. Similarly, you can set the fonts used for bold, italic, and bold italic fixed-width output.
All options take a single argument.
Some systems may want CR instead. Bold version of the fixed-width font. Still others use 1m instead of 8, or some mix of both. By default, section 1 will be used unless the file ends in .pm in which case section 3 will be selected. It was ignored.