Also known as: SmartNIC, and a bunch of other names, basically a NIC with an embedded CPU (usually ARM of some sort), so can offload some workload into the NIC.

An example is nvida's bluefield, there are others

That sort of thing is being used in a few areas, can even run ESXi on them.

There was a fun article on servethehome a while back using them to build an arm cluster (Link: https://www.servethehome.com/building-the-ultimate-x86-and-a... )

Datacenter processing unit, it's a rather new thing