First, a pseudo code example:

;(function(foo){

    foo.init = function(baz) { ... }

    foo.other = function() { ... }

    return foo;

}(window.FOO = window.FOO || {}));

Called like so:

FOO.init();

My question:

• What is the technical name/description of: window.FOO = window.FOO || {}?

I understand what the code does... See below for my reason(s) for asking.

Reason for asking:

I'm calling the passed in global like so:

;(function(foo){
    ... foo vs. FOO, anyone else potentially confused? ...
}(window.FOO = window.FOO || {}));

... but I just don't like calling that lowercase "foo", considering that the global is called capitalized FOO... It just seems confusing.

If I knew the technical name of this technique, I could say:

;(function(technicalname){
    ... do something with technicalname, not to be confused with FOO ...
}(window.FOO = window.FOO || {}));

I've seen a recent (awesome) example where they called it "exports":

;(function(exports){
    ...
}(window.Lib = window.Lib || {}));

I guess I'm just trying to standardize my coding conventions... I'd like to learn what the pros do and how they think (that's why I'm asking here)!