[pro] Reader macro definition in CLHS

[Kazimir Majorinc]

-------------------
reader macro n. 1. a textual notation introduced by dispatch on one or
two characters that defines special-purpose syntax for use by the Lisp
reader, and that is implemented by a reader macro function. See Section
2.2 (Reader Algorithm). 2. the character or characters that introduce a
reader macro[1]; that is, a macro character or the conceptual pairing of
a dispatching macro character and the character that follows it. (A
reader macro is not a kind of macro.)
-------------------

I do not understand item 1. In code

...
(set-macro-character #\G (lambda(s c) 9.81))
(setf s (* (/ G 2) (* tt tt)))

#\G is the reader-macro in a sense 2. What is the reader-macro in
a sense 1.?


Kazimir Majorinc