Answered: Engineer's Notebook

Would it still be considered an engineer’s “notebook” if I were to have a binder with grid paper in it (say if I were to have the proper table of contents, annotations, etc. in it)?

Does it have to be a notebook (composition notebook, a subject notebook, etc. rather than just a binder)?

Yes, simply using a binder with paper is sufficient.

No, the format of the notebook is completely up to the team.