"What is this S-shaped metal ornament on this house?"
A: "Anchor plate or wall washer. It’s meant to keep masonry in place. And made esthetic because they are visible. There a bolt going on the other side, in the center. And hold the bricks in place."
For you younger guys. Dating was much more fun before pantyhose.
It is used to keep the pistons from the disk brake caliper separated when the wheel is removed in case the brake lever is pushed accidentally.
It's from Adafruit, the company famous for their DD8008S and attempted takeover of Apple... so everything else is obvious.