lispdoc - results for set-dispatch-macro-character

(set-dispatch-macro-character disp-char sub-char function &optional
 (rt-designator *readtable*))
Function: Cause FUNCTION to be called whenever the reader reads DISP-CHAR followed by SUB-CHAR.
 Mentioned in:
CLtL2 - 22.1.5. The Readtable
HyperSpec - Function SET-DISPATCH-MACRO-CHARACTER, GET-DISPATCH-MACRO-CHARACTER
On Lisp - Macro Characters