What does BNB mean in fighting games?

I'm sorry, but the abbreviation "BNB" doesn't typically have a direct meaning in the context of fighting games. It's more commonly associated with the cryptocurrency ecosystem, specifically Binance Coin, which is the native token of the Binance exchange. Could you perhaps be referring to a different acronym or abbreviation that's specific to the fighting game community? If so, I'd be happy to help clarify if I'm familiar with it. Otherwise, I'd recommend checking the specific documentation or community forums related to the fighting game you're inquiring about to get a more accurate answer.