I really hate that "*nix" nonsense. If you mean Unix then say Unix. If you don't then say what you really mean.
But it's an old tradition dating back to the 80s. Because UNIX is the original AT&T stuff(1). See also: Unix-like
Better deal with, dude.
(1) UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.