I'm sure this is a simple answer but I have no idea what the difference is.
I replaced all of my bodies and heads with the Hunter MP series and I'm creating custom nozzles in my app for them. But I have no idea what the square or triangle key under the precip in/hr means on the performance data chart that Hunter provides. I can't seem to find legend, I'm guessing it is just something understood in the industry. So I'm not sure what value I should be using. So hopefully one of you smart people out there can enlighten me.