replace ASCII by macro call
diff --git a/Doc/ref/ref2.tex b/Doc/ref/ref2.tex
index c08f829..b9593b8 100644
--- a/Doc/ref/ref2.tex
+++ b/Doc/ref/ref2.tex
@@ -233,16 +233,16 @@
\verb/\\/ & Backslash (\verb/\/) \\
\verb/\'/ & Single quote (\verb/'/) \\
\verb/\"/ & Double quote (\verb/"/) \\
-\verb/\a/ & ASCII Bell (BEL) \\
-\verb/\b/ & ASCII Backspace (BS) \\
-%\verb/\E/ & ASCII Escape (ESC) \\
-\verb/\f/ & ASCII Formfeed (FF) \\
-\verb/\n/ & ASCII Linefeed (LF) \\
-\verb/\r/ & ASCII Carriage Return (CR) \\
-\verb/\t/ & ASCII Horizontal Tab (TAB) \\
-\verb/\v/ & ASCII Vertical Tab (VT) \\
-\verb/\/{\em ooo} & ASCII character with octal value {\em ooo} \\
-\verb/\x/{\em xx...} & ASCII character with hex value {\em xx...} \\
+\verb/\a/ & \ASCII{} Bell (BEL) \\
+\verb/\b/ & \ASCII{} Backspace (BS) \\
+%\verb/\E/ & \ASCII{} Escape (ESC) \\
+\verb/\f/ & \ASCII{} Formfeed (FF) \\
+\verb/\n/ & \ASCII{} Linefeed (LF) \\
+\verb/\r/ & \ASCII{} Carriage Return (CR) \\
+\verb/\t/ & \ASCII{} Horizontal Tab (TAB) \\
+\verb/\v/ & \ASCII{} Vertical Tab (VT) \\
+\verb/\/{\em ooo} & \ASCII{} character with octal value {\em ooo} \\
+\verb/\x/{\em xx...} & \ASCII{} character with hex value {\em xx...} \\
\hline
\end{tabular}
\end{center}
@@ -358,7 +358,7 @@
= ;
\end{verbatim}
-The following printing ASCII characters are not used in Python. Their
+The following printing \ASCII{} characters are not used in Python. Their
occurrence outside string literals and comments is an unconditional
error:
\index{ASCII}