“What is this part of the small grocery carts? Oddly shaped ring, about an inch and a half across and three inches tall.”
Answer: "It’s to hold the self-checkout you can sign up for. They’re usually by the entrances on a rack. I use this all the time."
Yeah. A rubber ball as a building bumper doesn't make sense. It wouldn't even last the night before someone pops it just for fun.
Whatever it's actually for, horses love to play with these these.
almost! It indicated where valves and/or connections are:
the top line is the ID, the second line tells you the distance in meters, left or right from your current position, the third line the distance forward.
so the top sign says it's 80cm (or 0.8 meter) to the left, and 11.2 meters in front of you
firefighters use these to locate water