What does it mean for a flour to be "strong" or "reinforced"?
Strong flour does mean higher gluten flour. I can't really find much info out about the Rinforzato flour. My guess would be that that could mean "enriched" but since another question (Red and blue Antimo Caputo 00 flour) seems to indicate that it has higher protein, it may just have some added vital wheat gluten to make it stronger.