From [0]:
> To list all packages no longer required as dependencies (orphans):
$ pacman -Qdt
[0] https://wiki.archlinux.org/title/Pacman> To list all packages no longer required as dependencies (orphans):
$ pacman -Qdt
[0] https://wiki.archlinux.org/title/Pacman`pacman -R -` will read names from stdin