Probably meant Pi here?

briandfoy++

Author: coke

doc/Language/quoting.pod6

@@ -207,10 +207,10 @@ brackets around the number, without any extra spaces:
 Compared to C<42/10> and C<1+42i>, there's no division (or addition) operation
 involved. This is useful for literals in routine signatures, for example:
 
-    sub close-enough-τ (<355/113>) {
+    sub close-enough-π (<355/113>) {
         say "Your π is close enough!"
     }
-    close-enough-τ 710/226; # Your π is close enough!
+    close-enough-π 710/226; # Your π is close enough!
 
     # WRONG: can't do this, since it's a division operation
     sub compilation-failure (355/113) {}