What does Unix stand for?

Unix is not an acronym; it is a pun on "Multics". Multics is a large multi-user operating system that was being developed at Bell Labs shortly before Unix was created in the early '70s. Brian Kernighan is credited with the name.

At Indiana University, to get support for personal or departmental Linux or Unix systems, see At IU, how do I get support for Linux or Unix?

Also see:

• In Unix, what do some obscurely named commands stand for?
• Where can I learn about the history of Unix?