AOPA Airports Guide

I can't find a listing in the legend for the meaning of the little circles often next to the end of the runway in the airport diagram. Some are filled in, some not. Always a 'P' or a direction arrow, I'm guessing, '>'. These don't always coincide with traffic patterns. What do they mean? I emailed AOPA but no help there.

I believe it stands for PAPI lights. A V would be VASI lights. I duduced this from where they are on my home and surrounding airports and not from finding a key.

Very good I bet you're right.