The term "3.30 formula" in relation to Bank Nifty does not have a widely recognized or established meaning. However, based on the search results, there are a couple of interpretations that can be inferred.

1. The 3-30 Rule: One interpretation of the "3.30 formula" could be related to the 3-30 rule in the stock market. This rule suggests that a stock's price tends to move in cycles, with the first 3 days after a major event often showing the most significant price change. Then, there's usually a period of around 30 days where the stock's price stabilizes or corrects before potentially starting a new cycle [1].

2. Trading Formula: Another interpretation could be related to a trading formula or strategy specifically designed for Bank Nifty. Unfortunately, there is no specific information available about a "3.30 formula" for Bank Nifty in the search results provided.

Learn more:

1. What is the 3.30 formula of Bank Nifty? - Quora
2. Amar Mandekar on LinkedIn: 3-30 Trading Formula | MCX GURUJI BankNifty Trading Formula | TRADE4WEALTH