A Hybrid Pole
If you don’t recognize these devices, there’s a good reason. They’re actually fairly new in their installation and purpose. When one person saw this, they immediately turned to the internet for help identifying it. This is actually just a high-tech antenna.
Reddit determined that it’s probably used to offer 5G service to people in the surrounding area. It’s small so as to be as unobtrusive and seamless as possible to users.