Final answer:
A Do Not Resuscitate (DNR) order is a medical order that instructs medical personnel not to perform CPR if the person's lungs or heart have stopped working. It is a legal document that specifies the patient's wishes and is typically shared with family and close friends.
Step-by-step explanation:
A medical order that instructs medical personnel not to perform cardiopulmonary resuscitation (CPR) if the person's lungs or heart have stopped working is called a Do Not Resuscitate (DNR) order. This is a legal document that specifies the patient's wishes and states that medical professionals should not attempt to revive or resuscitate the patient. A DNR order is typically shared with family and close friends to ensure that everyone is aware of the patient's wishes in case of cardiac arrest or respiratory failure.