VMware loves their acronyms and through the years has constantly changed the format for them from upper to lower case. vSAN has gone from VSAN to vSAN and now according to VMware the correct case for abbreviating VVols is vVols. It’s always frustrating when VMware does this, especially if you are a vendor and have to update a lot of different things when this happens. It’s especially frustrating this time because VMware originally had it as VVols and then they switched to vVols and then they switched back to VVols which it has been since 2016 and now they are going back to vVols. So if you want to be politically correct go search and replace as from this day forward it’s now vVols (until they change it again).
Wanted to highlight a comment and tweet from Lee Caswell as context around this: