And let's call this guy H subscript B. So this here, this PSI, Greek letter PSI, simply represents the orbital or wave function. So let's say PSI subscript haply means that this is the one S orbital of our ha atom. And this is the one s orbital of our HB atom. So when these orbitals atomic orbitals are very far apart, nothing really happens. But as I move them closer and closer, eventually, when I get to this point, these atomic orbitals will overlap, and they will create something known as the molecular orbital or molecular bonding orbital.