+.SS "Enquiries about symbols"
+Three macros are provided to enable simple enquiries about a symbol.
+Given a pointer
+.I s
+to a symbol table entry,
+.BI SYM_LEN( s )
+returns the length of the symbol's name (excluding any terminating null
+byte);
+.BI SYM_NAME( s )
+returns a pointer to the symbol's name; and
+.BI SYM_HASH( s )
+returns the symbol's hash value.
+.SS "Enumerating symbols"