GA aircraft windshield question

Hi, I have not been able to find the answer to this question just from Googling the words / terms, so I signed up here to ask directly.

I've noticed in some general aviation aircraft, like the Beech Baron for instance, there is a small, square area in the center of the front windshield.

What is that area? Is this some kind of heads up display or a heated area of window or what?

I've highlighted the area in question in the green square in the picture included.

Thanks for your help!