[Izzy Dunne]

What would you call it?

The rear window, of course.

It's not a "windshield", shielding you from the wind, if you're in front of it.

[spel_grammer_an_punct_polise]

Izzy, I have to assume that you have never ridden in the very back of a station wagon with the top door opened. It you had then you would know why the ‘rear windshield’ has always been called a ‘rear windshield’.