The Vent window.
Yes
Vent windows, and underdash air vents. Most of the underdash vents had a pull-knob to open and close.
A friend had a ‘66 Plymouth Barracuda that had vent boxes under the dash. You had to rotate a knob and then pull open a door on the box to get air.
The air ducts into the boxes were large enough that you could slip a fifth of Bacardi through the box, up into the duct and then close the airbox door. Even with the door open, it was hard to see the bottle neck. For those under 21 it was a perfect spot to hide booze, or so someone told me.