Apple LaserWriter 12/640 PS - Manual (Page 365)

Styled fonts
Most fonts that come with your LaserWriter 12/640 PS printer have defined
styles. For example, if you open the Bookman font (contained in a suitcase in
the Fonts folder, which is inside your System Folder), you see files for bold
and italic versions of the font.
But fonts such as Chicago, Geneva, Monaco, and New York do not come with
defined styles. If you open the Chicago font suitcase, you see only one file.
You can apply a style to a font like this by making a choice from the
appropriate menu (Fonts, Style, Format, or some similar menu, depending on
the application program). A font predesigned with a given style nearly always
looks better than a font with a computer-generated “derived” style.
About style names: Predesigned styled fonts sometimes have names you may
not be familiar with. For example, roman refers to a font without styling, or
plain. Oblique is similar to italic. Light, demi, and extra are different levels
of bold.
340 Appendix C