What is the term for the name tags before dialogue in a play?

Question

I remember my professor from years ago providing a specific technical term for the abbreviated name tags in front of dialogue in a play, e.g.

So: The Athenians don't just call it a suit, Euthyphro, but a public indictment.

Euth: What do you mean, Socrates? Someone has indicted you, I suppose, since I certainly wouldn't condemn you of the opposite, you indicting someone else.

Another post asked a similar question, Term for the identification of the person speaking in a dialogue, but none of the answers (character name, character cue, interlocutor), seem to be the term I'm looking for. It might just be an obscure academic term that has since been simplified to character name, but if anyone can recall a different term, please let me know.

Answer 1

It's been nearly a year since I posted the question, and I just stumbled onto the answer while studying ancient Greek manuscripts. I happened to see the term listed in the index of Eric Gardiner Turner's Greek Manuscripts of the Ancient World, although not directly discussed in the book, but the name of the term seemed very familiar.

The term is notae personarum.

I remember my English professor was discussing Renaissance manuscripts when the term came up, so I think it might be used more commonly in the study of manuscripts than drama.