What does "int*&&" do in C++?

I'm coming from a C# background and trying to learn a little C++. I came across the following lines:

int x[3] = { 1, 2, 3 };
int*&& y = x;
int* z = y;

I know what pointers and arrays are and have some small understanding on lvalue and rvalue references. However I can't wrap my head around what int*&& y = x; actually does. It would read like it creates a pointer to an rvalue reference, is this correct? What would be the use case of something like that, e.g. what is going on in memory if we execute this?