Gets a value indicating whether the font is symbolic: the Symbolic flag without the Nonsymbolic flag, a name of a symbol font (Symbol, Dingbats, Wingdings, Webdings), or the Standard 14 Symbol or ZapfDingbats. A symbolic font is never given a Latin text font in its place.
public bool IsSymbolic { get; }
ISO 32000-2 §9.8.2, Table 121: the Symbolic flag "may affect ... font substitution strategies".