Syntax information for use by the Lisp reader is embodied in an object called a readtable. Among other things, the readtable contains the association between characters and syntax types.
The next figure lists some defined names that are applicable to readtables.
*readtable* readtable-case copy-readtable readtablep get-dispatch-macro-character set-dispatch-macro-character get-macro-character set-macro-character make-dispatch-macro-character set-syntax-from-char
Figure 2-1. Readtable defined names
18.104.22.168 The Current Readtable
22.214.171.124 The Standard Readtable
126.96.36.199 The Initial Readtable