Most all states regulate the use of certain “engineer” terms. Until one is registered as a Professional, you are not allowed to refer to yourself using variations of “engineer” (e.g., registered engineer, licensed engineer, Mechanical Engineer, Professional Engineer…). You will most likely reserve the right to title yourself as an Engineering Intern (e.g. Mechanical Engineering Intern) or an Engineer in Training, this varies state to state. The acronym EIT or EI can typically be used in your signature to announce to people that you are an Engineer in training or Engineering Intern.
Use the resources on this site to learn more about what the Engineer in Training Exam can do for you both personally and professionally.