ANSI Common Lisp 13 Characters 13.1 Character Concepts 13.1.2 Introduction to Scripts and Repertoires
18.104.22.168 Character Scripts
A script is one of possibly several sets that form an exhaustive partition
of the type character.
The number of such sets and boundaries between them is implementation-defined.
Common Lisp does not require these sets to be types, but an implementation
is permitted to define such types as an extension. Since no character
from one script can ever be a member of another script, it is generally
more useful to speak about character repertoires.
the term "script" is chosen for
compatibility with ISO terminology, no conforming implementation
is required to use any particular scripts standardized by ISO
or by any other standards organization.
Whether and how the script or scripts used by any given
implementation are named is implementation-dependent.