A registered nurse is a person who practices professional nursing. Professional nursing means the performance for compensation of any act in the observation or care of the ill, injured or infirm, or for the maintenance of health or prevention of illness of others, which act requires substantial nursing skill, knowledge or training, or application of nursing principles based on biological, physical and social sciences, such as the observation and recording of symptoms and reactions, the execution of procedures and techniques in the treatment of the sick under the general or special supervision or direction of a physician, podiatrist, or dentist, or under an order of a person who is licensed to practice medicine, podiatry, or dentistry in another state if that person prepared the order after examining the patient in that other state and directs that the order be carried out in this state, and the execution of general nursing procedures and techniques. Except as provided in s. 50.04(2)(b), Wis. Stats., the practice of professional nursing includes the supervision of a patient and the supervision and direction of licensed practical nurses and less skilled assistants. Except as provided for in s. N 3.05(4)(c), Wis. Admin. Code, no person may practice or attempt to practice professional nursing, nor use the title, letters or anything else to indicate that he or she is a registered or professional nurse unless the person holds a current registered nurse license granted by the Board of Nursing.