Apple Color StyleWriter 2500 - Manual (Page 112)

Suitcases
A font suitcase is a special folder for collections of fonts.
Suitcases provide a convenient way to organize fonts in the same font family.
For example, it’s a good idea to use a single suitcase (called Courier) for all
fonts in the Courier font family—all Courier roman fonts as well as fonts
with names like Courier Bold and Courier Oblique.
103 Using Fonts With the Color StyleWriter 2500