I was kind of wondering that myself, so I did a google search.

I cam up with "Bank Of Valetta", "Brothers Of Vengence", and this one:

BOV Design -      WWW-.    -  WWW-  ��.     ��   .          .        ��  ,  ,    .

Then I stumbled upon "Blow Off Valves", which is probably it, but I have absolutely no idea what it is...

:-(