As per the highlighted section in this picture.
The name for the section of vertical tiling underneath a bay window
rooftilingwindows
Related Solutions
It's a window latch and keeper. Unscrew a good one, head over the your local hardware store, and see if they have a match in stock. Pay close attention to the distance between the screw holes and the how tight the two parts are pulled together. They come in a lot of styles, e.g. this would work if the keeper was on a horizontal instead of on a vertical surface:
You can also look online, and worst case scenario, you'll have to go to the window manufacturer to get the replacement parts.
There are standard curtain rods for bay windows such as this one
There is also no reason you cannot use three rods, placed close to one another, one for each window.
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Best Answer
As odd as it may seem, it's a roof. A bay window roof. In the picture you provide, it's actually a roof for the lower bay window, as opposed to being part of the upper bay window.