Powerline font in framebuffer console
When using a "Powerline"-based prompt such as ZSH agnoster, the prompt looks good in a graphical terminal emulator, but will probably look garbage in the framebuffer or VGA console, due to the missing font glyphs.
There is a special bitmap-based powerline font suitable for the framebuffer console. On some systems the console setup tool setupcon is buggy and has to be patched in order to enable loading a custom font.