I came across this abbreviation in Português Empresarial. Nobody seemed to know what it meant but a Brazilian named Cynthia solved the mystery. It stands for ” volume de negócios” -ie, a company’s turnover. I don’t know why the second V is there. Maybe the person who invented it had a stutter (“gagueira” if you want to know – or “gaguejar” in the verb form)
VVN
Luso 