Strange font in custom indicator

I am getting strange characters in some of my indicators. I have attached a screenshot showing an example.

In bottom indicator the Ys should be dots.

If anyone has a clue what this could be, I would appreciate any suggestions.

My thoughts are that I'm missing a computer font, but have no idea what it is.

Thanks very much in advance for any help you can offer.

--Wally

Check that you have the Wingdings font installed on your computer

Thank you very much, Gumrai, that did the trick!