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+:mod:`symbol` --- Constants used with Python parse trees
+========================================================
+
+.. module:: symbol
+   :synopsis: Constants representing internal nodes of the parse tree.
+.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
+
+
+This module provides constants which represent the numeric values of internal
+nodes of the parse tree.  Unlike most Python constants, these use lower-case
+names.  Refer to the file :file:`Grammar/Grammar` in the Python distribution for
+the definitions of the names in the context of the language grammar.  The
+specific numeric values which the names map to may change between Python
+versions.
+
+This module also provides one additional data object:
+
+
+.. data:: sym_name
+
+   Dictionary mapping the numeric values of the constants defined in this module
+   back to name strings, allowing more human-readable representation of parse trees
+   to be generated.
+
+
+.. seealso::
+
+   Module :mod:`parser`
+      The second example for the :mod:`parser` module shows how to use the
+      :mod:`symbol` module.
+