There is no problem with copying the symbols. The GNU License allows you to do that. I actually want people to freely share the laborious work that no one needs to repeat. However, your font contains no license agreement or agreement link.
There are different types of license that are more specific GNU licenses just for fonts, but I just use the general GNU License. Most fonts are copyrighted (as yours is) and cannot be copied. A GNU License doesn’t try to prevent anyone from copying and modifying your work, provided they use a different font name and don’t try to claim the work as their own intellectual property. Some call it CopyLeft instead of CopyRight.
If you don’t wish to release your fonts under an Open License, then you should remove the symbols and add your own designs later when you have time.