This is one of the rarest patterns seen in nifty.
2 flat abc correction each separated by wave X followed by a triangle at the end.
The details about this type of correction pattern you can read in book "Mastering Elliot Wave" by Glenn Nelly.
Just sharing what I have read in the book.
Thought this is my first time seen this pattern actually playing out.
If this is what nifty playing out then we are somewhere in the last leg before it starts travelling to the North.
all the best.