WWE likes to give all wrestlers a secondary nickname/tagline that can be used in conjunction with the regular name.
For Sting, the name that has been decided is “The Vigilante”.
“The Vigilante” Sting was the choice instead of something like “The Icon” Sting, as there was no interest in using the same nickname as in TNA.
Announcers and all talent have been told to use the Vigilante nickname anytime Sting is mentioned on TV, and it’s reportedly a mandatory directive with no exceptions.