You should be able to just use the character itself:
trace("Haxe is great :) ␆" );
But whether or not that's feasible depends on your usage.
Question
How to use unicode characters in haxe 3?
I tried this example:
trace("Haxe is great :)"+"\u0600");
But, it will not work, I get this error:
character 29 : Invalid escape sequence
So, how would I add unicode strings? Here is where to try it: http://try.haxe.org/#be311
Solution 2
You should be able to just use the character itself:
trace("Haxe is great :) ␆" );
But whether or not that's feasible depends on your usage.
OTHER TIPS
Why not just paste the unicode character? It seems to work for me
Look at this http://try.haxe.org/#38E77
edit: relevant code in case try.haxe stops working:
trace("Haxe is great :)"+"本");