C++ pointer, reference - **, *&, &&, &*

Let's think about pointer and reference with - &&, &*, ** and *&

• int &&a;
  ILLEGAL : '&&' is a comparison syntax, not a pointer nor reference thing. Pass.
  
  
• int &*a;
  ILLEGAL : (pointer-to-reference) Can't declare a pointer to int&. Reference is another name of an object(you can't set a pointer to a 'name').
  
  
• int **a;
  pointer-to-pointer : You can use
  value(**a), pointer address(*a) and pointer's pointer address(a).
  
  
• int *&a;
  reference-to-pointer : You can use
  value(*a), pointer address(a) and pointer's pointer address(&a).

Get confused :) ?