Hello,
This is interesting. I've been involved in the electronics field in some form or another for many years but either I didn't know such a thing was called a nullator or or nullor, or else I had long forgotten about these terms.
There are some unusual things that come up like this from time to time.
Another one I like to call an "anisotropic short" is another unusual item that can be used in electronic circuit analysis to better understand what is going on. Currently in mainstream electronic/electrical network analysis I do not think there is a name for it, and that seems strange because when it comes up there's no way to explain it.
Note: Another name would be "aniselectric short" which I may prefer because it is more specifically aimed at the electrical properties of such an entity.
I thought that name was appropriate because it is a short for current, but an open circuit for voltage. That means when we analyze a circuit in that place for current, it becomes a perfect short circuit (zero Ohms) yet when we analyze it for voltage, it becomes a perfect open circuit (infinite Ohms). Thus, depending on how you measure it, it is either a short circuit or an open circuit, and that leads to the prefix "anis" or "aniso".
This is another unusual thing for circuits used mainly during an analysis. There was no name for it so I thought it was appropriate to call it something so that it could be referred to as an known object with known properties rather than some mysterious thing that has no appropriate name.
As to other thing us humans do is assign the title of "noun" to things that do not really exist on their own. Initially you would think everything we call a noun is a physical object of some type that is made up of some kind of material or something. However, it seems we call things nouns sometimes just to make it easier to talk about and deal with on an everyday basis.
The best example I think is a "hole", like a hole in the ground. There is nothing there, yet we assign it a name that implies that there is a physical object there. It's actually 'made up' of a surrounding material that is actually there, like dirt (a hole in the ground). But notice I even had to put the phrase "made up" in quotes because it is hard to say it is made, yet it is made, and if something is made, it should be a noun. We have to call it something because we encounter these things on a daily basis, and it's easier to refer to it as a 'hole' rather than say that it's a "lack of dirt".
"Hey John, look at that lack of dirt over there!". "Oh yes, I see it now".
Language is just another approximation when it comes to describing nature. It's more a matter of convenience to name things that do not really exist.
"Nullator" is interesting because it assigns a noun to not only something pseudo physical, but also that it has some sort of process associated with it which causes an action. Also, in theory it is a perfect mechanism, but in practice it is not perfect just an approximate mechanism.