man.th.extra3.suppress — Suppress extra3 part of header/footer?
If the value of
non-zero, then the
extra3 part of the
.TH title line header/footer is
The content of the
extra3 field is usually
displayed in the middle header of the page and is typically a "manual
name"; for example, "GTK+ User's Manual" (from the
gtk-options(7) man page).