Daft question, I know, but.....
I work in the military FJ community and sit in the back doing the thinking, EW and radar etc.
we use V go, V stop, V rotate, V unstick V embs etc for Go-safely airborne 1 engine, stop with/without using cables, rotate & unstick are obvious and embs = emergency braking speed at which you can stop the ac using brakes only in remaining runway. All are individual runwayaand temperature specific.
I've never related these to equivalent civilian V1, V2 etc, so what are they exactly? - or if not QFI exactly, aircrew practical may be more use!!
I have high speed aborted, but have the advantage of rev thrust, a cable, usually a barrier or eventually martin baker so my experiences may be a little different!