Syntax: #\<<x>>
When the token x is a single character long,
this parses as the literal character char.
Uppercase and lowercase letters are distinguished after #\;
#\A and #\a denote different character objects.
Any single character works after #\,
even those that are normally special to read,
such as left-parenthesis and right-parenthesis.
In the single character case,
the x must be followed by a non-constituent character.
After #\ is read,
the reader backs up over the slash and then reads a token,
treating the initial slash as a single escape character
(whether it really is or not in the current readtable).
When the token x is more than one character long,
the x must have the syntax of a symbol
with no embedded package markers.
In this case, the sharpsign backslash notation
parses as the character whose name is (string-upcase x);
see Character Names.
For information about how the Lisp printer prints character objects, see Printing Characters.