Why should we demand that any "stuff" we want to label already has some special properties to be called "principle" (not to say "holy principle").

"Something" may have very little features (say, vacuum, or time, or space) to assume that it may correspond to something else.

Or we then have to agree on what we mean by "principle" first (because I understand by word "principle" some relationship between two or more objects or phenomena, or classes of objects/phenomena). Say, symmetry principle (unchange under transformation): right=left, before=after. Or equivalency principle: gravity = acceleration.

So, I think, word "principle" is not proper word to describe labeling, or naming objects (or phenomena). It suggests, that there is something more than just an object itself.