What is From feed?

"Form feed" is shorthand for something like "feed a new sheet of paper
into the printer" (implicitly meaning that the current page is ejected).

The '\f' character is a form feed. It moves the active position to the
start of the next logical page. If you are sending it to a cut sheet
printer it might make the printer eject the current sheet. If it is to a
continuous feed printer it might make the printer advance to the next
perforation mark on the roll. If there is no performation mark then it
will advance to whatever the printer driver detemines is the start of the
next page.

Beyond the examples given, it is really open to interpretation.

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