# Why is the close looped model under control called plant?

I am not sure if the question even belongs here. Please correct me if it is out of context.

Consider a closed feedback loop.

Usually, we say that $$K^L(s)$$ is a controller over the plat $$G(s)$$. Is there any reason it is called a plat?

The controlled system may be a car with cruise control, an actual plant, or even the famous F15. These are not necessarily plants. Was the theory originating from real plants and factories?

I am looking for something anchored in resources and not an intuitive explanation.