three-bet
(v) raise a raise, that is put in the third bet; often followed by the name of a person. "He opened, I raised, and he three-bet me." "I opened, Sue raised, and Willie three-bet the pot."
I guess the terminology applies more to limit than no-limit.
However, in no-limit the first bet is just a "bet", not a raise. Right?
So in this case UTG+1 is not "raising a raise". I.e. he's only 2betting.
/g2