That's not a symbol, it's a sign with text.
When I was a kid, the church I went to installed signs that said "Thou shalt not park here".
Always thought that was pretty clever.
Excellent. Now to get my neighbor's car keys...
Too circumspect and easy to overlook as a joke
I've taken a picture of this same sign! Somewhere between St. Louis and Dallas?
Why the last car? It would be more effective if it was written, for example, as "All cars that parked here are still missing".
But how would, that sign know when/if the car was found? There's no way it could be updated. I'm calling bull, shit!