A disastrous or feeble attempt at making what, in other parts of the World, is know as delicious Pizza. They will only sell it as a Pie because they know if you try a slice you will not buy anymore; see capitalism. Although there are exceptions they are often found in the two nice sections of the city called Squirrel Hill and Oakland and not worth naming. The sad part is Pittsburgh Pizza itself is hard to find because the city and metropolitan area is engulfed in Pizza Chains; see Pizza Hut.
I visited Pittsburgh and had to buy a whole damn pie of Pizza and it was horrible! I will never eat Pittsburgh Pizza made by yinzers again, where are all the Pittsburgh Italians, are there any?