For full clarification, you'll have to ask fellow VX member "MARLIN", as he has his front badge inverted on the grill of his VX. However, folk legend has it that it means "NZNSI", which is a subsidary company of Nissan.

Personally; I think the front grill badge looks frickin' cool inverted and I would do it to my VX, except I like to keep my VX original OEM (except for tires and the KILBY of course).