There are a variety of names. DAC is something Ethereum came up with. Before then they were being called autonomous agents:
https://en.bitcoin.it/wiki/Agents
I was never totally clear on the difference, but as people often refer to Bitcoin itself as a DAC, I feel the term is too vague to be useful.
The next step to make these REALLY useful for agents is to set up Intel TXT on them. This would likely involve some voodoo as TXT is appallingly badly documented. But, if you make sure the hardware is compatible and that hardware virtualisation integrates properly using tboot it should be possible.
This step is a game changer because then an agent can get a hardware-rooted proof that the remote system is secure including against Kordless or whoever else owns the hardware. The agent then knows it's safe to install a copy of itself on the new machine, have the copy create a wallet, and send money to the new box such that the operator can't steal the money but the new agent can still pay for its own hosting costs.
Once done the agent would effectively be autonomous if it had a way to earn income e.g. reselling disk space. Scary stuff!