what does the NS stand for?

Silly question, I know, but it should be quick and easy to answer.

I've done some cli C++ and a little C# to do some math programs. Now that I have a fast computer I'm trying to get back into Xcode and I've done a few tutorials and feel that I'm making great progress. But there is one thing that's bothering me and I'm surprised I haven't come across the answer yet.

I see the IB prefix on so much of the code and it obviously stands for Interface Builder, which helps me understand what I'm doing.

But what does NS stand for?

NS stands for NextSTEP which was a software from Next which Apple acquired. They've stuck with it..it basically means it belongs to the Cocoa framework..

Regards

Thank you very much. That actually helps me a lot because it keeps my brain from getting distracted over what that could possibly mean anymore.