This indicator combines Volumes of all the open contracts of
NSE FUTURES (e.g. NIFTY FUTURES) and Combines them together.
For e.g. Default Ticker is set to NIFTY1!
NIFTY1! + NIFTY2! + NIFTY3!
Since NIFTY3! is not available on Trading View one has to manually add (via indicator settings) the last (third) running month's Futures contract symbol (NSE stock future symbol) in this.