If you are using VSCode on Ubuntu and your shell is Zsh (Oh-my-zsh) you can meet the problem with incorrect charectars display in VSCode terminal.

How to fix it?

1. Download correct font for VSCode terminal from Meslo LG M Regular for Powerline.ttf
2. Go to Downloads folder and install downloaded font (double-click on the font file and press install button in the font view dialog)
3. Open VSCode and open settings (File -> Preferencies -> Settings or Ctrl + ,)
4. Find terminal.integrated.fontFamily option and set it to Meslo LG M for Powerline
5. Setting will automatically saved and your terminal in VSCode now working as expected

That's it! Have fun!