They have used "BNL" officially. I recall they had an Enhanced CD (maybe Rock Spectacle) with a video that began "This is BNL TV", but I can't find a copy on the internet.
I used to run a wonderful BNL Geocities page back in the 90s. I was interviewed by Entertainment Weekly about it, which is the most random moment of my life.
Yeah it was so random. I remember the journalist leaving me a message on my parents' answering machine and was so shocked. It amounted to just a sentence or two but it was still wild.