It’s an old sign with the name of a district or location. Usually installed by the builders. © DOUCYIMD1 / Reddit
16. “Tennis racket with a hook on the back, on a long chain with ball at the end.”

This is used to measure the height of the net in tennis. The hook hangs on the top of the net and the net is tightened till the ball just touches the grass. © Tricky_Extreme5862 / Reddit
Did you know any of these odd objects? Let us know in the comments below which one you possess.
