V2
As a former FAA examiner let me give you my perspective and the US definition:
V2, The climb speed is the actual climb speed at 35 feet above the runway surface as demonstrated in flight during takeoff with one engine inoperative.
just a note, It is recommended that you maintain V2 until obstacle clearance has been achieved (400ft if no obstacles) then accelerate to Venr at which time you can then retract the flaps.