When your Nerd Font not displaying any icons on (Arch) Linux.

NERD-FONT-SYMBOLS.md

1. Remove no-bitmaps setting from your fontconfig:

mv cd /usr/share/fontconfig/conf.avail/70-no-bitmaps.conf ~/Downloads

2. Install ttf-nerd-fonts-symbols, ttf-nerd-fonts-symbols-common and ttf-nerd-fonts-symbols-mono packages from AUR:

yay ttf-nerd-fonts-symbols

3. Add your Nerd Font to /usr/share/fontconfig/conf.avail/10-nerd-font-symbols.conf:

<alias>
  <family>Your Nerd Font Family</family>
  <prefer><family>Symbols Nerd Font</family></prefer>
</alias>

4. You may need to reboot.