"Rearview Mirror"
"Use the rearview mirror tab to stave off those bright lights. Next time some guy has his high beams on and blinds you through your rearview mirror, remember to press down on the tab of your rearview mirror, so it angles down. That way, the light reflects downwards without impacting your field of vision.On manual tilt versions, a tab is used to adjust the mirror between “day” and “night” positions. In the day view position, the front surface is tilted, and the reflective back side gives a strong reflection."
https://www.amazon.com/Panef-Corp-Powdered-Graphite-Lubricant/dp/B0016GZQ60
Now I don't use hairpins but I would think the side WITHOUT the sharp pointed end would be better against your scalp?