Examples and reference to further explanation for Unicode in Perl 6 s…

…yntax

doc/Language/syntax.pod6

@@ -18,7 +18,9 @@ errors and give good error messages.
 =head1 Lexical Conventions
 
 Perl 6 code is Unicode text, current implementations support UTF-8 as the
-input encoding.
+input encoding.  More detail on Perl 6 syntax and Unicode is discussed
+in L<Unicode versus Texas symbols|/language/unicode_texas> as well as
+parts of other documents related to those topics.
 
 =head2 Free Form
 
@@ -167,6 +169,7 @@ alphabetic character.
     with-numbers1234
     don't
     fish-food
+    π
 
     # not valid identifiers:
     with-numbers1234-5
@@ -195,6 +198,9 @@ name of the identifier.
     # "GLOBALish", "\$¢", "\$=finish", "\$/", "\$foo:bar<1>", "\$foo:bar<2>",
     # "\$?PACKAGE").Seq␤»
 
+Unicode superscript numerals are exponents and not part of an identifier;
+e.g. C<$x²> does the square of variable C<$x>.  Subscript numerals are TBD.
+
 =head1 Statements and Expressions
 
 Perl 6 programs are made of lists of statements. A special case of a statement
@@ -330,6 +336,7 @@ L<Rat|/type/Rat> literals (rationals) are very common, and take the place of dec
     3.14159
     -2.5        # Not actually a literal, but still a Rat
     :3<21.0012> # Base 3 rational
+    ⅔
     2/3         # Not actually a literal, but still a Rat
 
 =head4 Num literals