Term derived from Latin for works made using a movable letter technique prior to the 16th century.
It is estimated that between 27,000 and 40,000 works were produced with this method in the 15th century.
Incunabula usually have no title page, and there is often no reference to the printer, or year.
Since it is assumed that early printers also produced their own type, the origin of incunabula can be determined by comparing the type used.