How to get a tick mark on the right answer instead of a square root!

Another problem that i seem to be facing is that in a matching puzzle game. Its basically for kids, in which they have to match the names of the fruit. On clicking the wrong button for answer, X will appear, and for clicking the right button for the answer a tick mark will appear. Now eveything seems to be wokring just fine EXCEPT when i copy the tick mark from the character map and paste it into the script which is :

on (release) {
input = “√”;
play();
}

so instead of the tick i get the SQUARE ROOT!!! how do i get the tick mark for the right answer???