Probably, but unlike the little red dot on the rear window by the tip of your wiper, this one makes little sense. The window is going to fit where it fits, and the printed arrow is not even centered. There is nothing obvious that lines up with it. Strange.
The OP's photo was taken off-center. Could just be a quick QA sanity check to see if the solar sensor and rear view mirror (and some other interior items???) are where they should be.
I was looking closely at it last weekend and if I had to guess I would say it is an alignment market for the front-facing camera
