Special fonts are those that
gtroff searches when it cannot find
the requested glyph in the current font. The Symbol font is usually a
gtroff provides the following two requests to add more special
fonts. See Using Symbols, for a detailed description of the glyph
searching mechanism in
Usually, only non-TTY devices have special fonts.
fspecialrequest to designate special fonts only when font f is active. Initially, this list is empty.
Previous calls to
fspecialare overwritten; without arguments, the particular list of special fonts is set to empty. Special fonts are searched in the order they appear as arguments.
All fonts which appear in a call to
See Using Symbols, for the exact search order of glyphs.