This package applies icons from nerd-icons to to tab-line tabs. The minor mode `tab-line-nerd-icons-global-mode' adds an :around advice to the default function `tab-line-tab-name-format-default' for tab-name-formatting. If you use a custom function for tab-name generation, you need to add the advice manually. This should work in GUI mode and terminal, as long as `nerd-icons' is properly installed.