Have you put symbols like ©, ™, ←,↑,→,↓, ¼, ½, ¾ in your map?
Just open MS Word and go to insert -> symbol and choose anything you like and paste it to text field in SC map editor. But beware that some symbols won't be displayed correctly. It will leave a question mark as SC map editor can't interpret that particular symbol.
What can you do with these symbols? Well, I've found a symbol that has got 3 dots in trianglar structure. I'm gonna use it as laser aim from Predator's Shoulder cannon.
If you don't know about "Predator" then find about it in google. Try typing in Alien vs. Predator.