I miss the big giant floor vents that scooped air in by your feet. They were way better than air conditioning, so long as the vehicle moved.
Funny you should say that. My husband told me yesterday that he heard a thing on the radio. The drag created by open windows is less efficient, gas mileage-wise, than running the AC. Go figure.
I recall the being refered to as a ‘quarter glass’. When we recieved our registration labels they were to be affixed to the quarter glass as per the directions on the registration certificate. This was late sixeties early seventies.
Picture of a car similar to what I used to have, ok it’s much nicer but still very similar.
Linked picture showing add for 1/4 glass.
I miss those too (BTW, I called 'em vent windows). I had them on my old '67 Mustang and spent plenty of time cruising the highway, having all the moisture sucked from my body ina futile attempt to keep cool. Now I have an '88 Cherokee which has a little triangular vent window but it’s fixed in place. 
I don’t understand why the designers wouldn’t have put in a openable window in such a perfect place. (And it would be very useful for me since my AC went out fifteen years ago.
Hey, I just did a search for jeep cherokee vent windows and they sell retrofit movable vent windows on ebay! I wonder how difficult they’d be to install…
Wind Wings.
Their disappearance was one of the things that my dad thought of as a sign that the world was going to hell in a handbasket and that Americans were being taught to Mindlessly Obey. I can hear the echo of the ranting now.
I liked 'em as a kid 'cause they were cute and child-sized. Also you could play with fluid dynamics a bit by moving them around. Oh, and we were allowed to open them while the car was moving fast. Opening a window on anything but a residential street was forbidden because a bug flying in at speed could put your eye out.
Anyway - - - wind wings.
In my family, growing up in the suburbs of Baltimore, they were just the “wings”.
When I was little they were called ‘wind wings’. Nowadays I hear ‘wind wings’, ‘quarterlights’ and ‘vent windows’ with about the same frequency.
I always heard them called CVs or “Cross Vent” windows.
According to the the factory service manual for my 1969 Chrysler Newport, they’re called “Vent Wings.” Dunno why I didn’t think to look in that earlier.
Dad had those in his '84 Volvo 740. That and the overdrive had he and Mum feeling nostalgic for their old MGB and Spitfires. Well, Dad at least 
EDIT: And rereading back up to GawnFishin’'s post, I’ve seen the words “quater glass,” used in old UK car magazines.
The one time I locked my keys in my car, and I was out of town no less, I had left that little window open. Thank Og.