What does @ do in the name of the variables?

In the response code this question in SOen I found an unfamiliar statement line in C #. I tested this line and it works, but I did not understand the meaning of this @ character behind the member name.

// declara "@foo" como uma string com o valor "bar"
var @foo = "bar";
// declara "@abc" como um tipo anônimo com sub valores
var @abc = new {a = 32, b = 64, c = 128}

And I also noticed that it works with classes and types:

class @Program {
    void @Main (string[] args) {
        ...

But by passing the name over the names, Visual Studio's IntelliSense removes @ from names:

And I can also call members with or without @ :

void @Foo () {
    Bar();
    @Bar();
}
void @Bar() {
    ...
}

And even if @bar does not have @ , it can be called with it in the same way.

And I can also declare a method called void :

void @void () { ... }

I know that in Visual Basic, you can declare members with names already reserved by the language using [...] in the names. This is the same thing, only in C #? Or do you have another role besides that?