I believe that those symbols are the ones that come with ProFantasy's Cosmographer. As such, they are ProFantasy's property and cannot be redistributed. Cosmographer is an add-on for Campaign Cartographer 3. You would have to look at the CC3 license to determine if you are permitted to use the symbols in your game once you've purchased the program. I don't think that would be a problem, but I haven't examined the license with that in mind. Or you could possibly negotiate with Profantasy directly for a license for the symbols only and not the rest of the software.