The V scale is named after John Sherman, whose nickname is Vermin, and yes, he’s amazingly strong! V0 is generally the lowest end of the scale and equates to about American 5.9+ (which some will say is Aussie 17).

I’ve heard people here say that you add the number 21 to the V number and that gives you an approximate rating in the Aussie system- so a V3 would be 24. However boulder problems aren’t as long as a route- so you can probably boulder at a higher level than you can climb roped routes . . . . And some people will say (maybe correctly) that you can’t compare the two systems at all.

But that’s just in my mind and I’m sure there are others who will disagree- and I’ve yet to find any boulder problems at any of the gyms given a V scale rating!