I read many article about operating system, and find many following situations:

You see, there is *nix systems in the web page, why not the Unix? why there is * to replace it?

Because I found many case, so I doubt if there is other meanings here.

So, I want to ask this type question in Unix&Linux site, but I don't know if is in legal.

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The good news is that you don't have to, because someone already did: Why is there a * When There is Mention of Unix Throughout the Internet?.

There is a legitimate historical question there that is on-topic. There probably aren't very many other questions of the same sort, but this is one that has been addressed.

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