p.s. I hope this helps--I just went over all your posts and discovered that you have been trying to get an understanding of this since April 30th!
It means that you have a breast tumor that is more than 2 cm, but less than 5 cm in diameter (pT2), and that some tumor cells were also found in the tested sentinel nodes, but not in great enough numbers to be labeled as "lymph node positive."
pNO(i+) means: "No regional lymph node metastasis histologically, positive IHC, and no IHC cluster larger than 0.2mm."
I can't explain any more about it than this, but the upshot is that you are currently classified, and will be treated, as a lymph node negative patient.
Best wishes...