D versus Objective C Comparison

[Nick Sabalausky]

"Michel Fortin" <michel.fortin at michelf.com> wrote in message 
news:gmbt40$18pb$2 at digitalmars.com...
>
> Perhaps it's offtopic in a D forum, but you should use the class 
> NSCharacterSet for that if you want to be efficient. There's a couple of 
> methods in NSString accepting NSCharacterSet too which you may be 
> interested in if you're writing a parser.
>

Nick Sabalausky is curious what the "NS" stands for in "NSString" and 
"NSCharacterSet"...?