Randy Orton's finishing move. It is a jumping variant of the "cutter" wrestling move, which was innovated by Johnny Ace (a.k.a. John Laurinaitis), calling it the Ace Crusher.
The jumping cutter is not exclusive to Randy Orton himself. Other users of this variation includes former Bullet Club leader/member "The Machine Gun" Karl Anderson, who calls his version as the Gun Stun. Current Bullet Club member Tama Tonga also uses this variant and retains the Gun Stun name.
Randy Orton named his version after the initials of his full real name: Randal Keith Orton.
