Powerline symbols aren't working?

Just downloading and installing the fonts is not enough. In order to get the Powerline symbols, you need to tell Terminal to use one of the patched fonts you downloaded.

This can be done from the menu Terminal->Preferences.... In Settings->Text click on the button Change... in the section Font. Choose any font with "Powerline" in its name and you should get to see the Powerline symbols.

I just set the font dejavuSansMono NF and problem solved