Since Unix is a copyright of AT&T, the term "UN*X" was created to avoid having to place a (TM) after the word every time it is used. Lawyers have since determined that the (TM) after Unix is not necessary, but the term UN*X still remains. It is commonly used to refer to the wide variety of Unix-like operating systems, including Linux, HPUX, and Solaris.

See also : MMDS  
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