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Explanation: The n.o. (nulla osta - nihil obstat - official approval) allows a qualified surgeon to actually practice, so it's like the surgeons license.
So this would be the "Medical Licensing Examination" including the surgery section.
"The United States Medical Licensing Examination (USMLE™)is sponsored by the Federation of State Medical Boards ..." http://www.usmle.org/
Thank you for your help. Sorry I took so long to get back to you. I thought the NO part might refer to Nuovo Ordinamento and the recent change in regulations governing what future doctors and surgeons actually learn during their university degree! 2 KudoZ points were awarded for this answer