The most general class of undifferentiated text objects.
There may be valid names that are exactly the same strings as NL texts, so it would be overconstraining to require these two classes to be disjoint. The distinction between names and NL texts is in their intended use, rather than their forms. This happens because we don't represent what the strings denote. If we did, then we could offer a formal basis for distinguishing between these two classes of text strings.