Here are some pictures of Bollard fences https://www.bing.com/images/search?q=Bollard+Wall&FORM=RESTAB
They are sometimes called walls but it’s made by fence companies. If you look at the pictures of the samples you will see one just like them “only ten feet taller”
When the President went to Southern CA to view the prototypes he even mentioned that the larger the cylinder on the top was, it made it much more difficult to get over the wall/fence. I like it.