Final answer:
A red wristband on a patient signifies that the patient has a Do Not Resuscitate (DNR) order.
Step-by-step explanation:
A red wristband on a patient signifies that the patient has a Do Not Resuscitate (DNR) order. A DNR order is a written legal document that states that if a person stops breathing or their heart stops, medical personnel are not to take steps to revive or resuscitate the patient. This order is often included in a living will or advance directive, which is a document that specifies the medical interventions a person wants or doesn't want in case they become incapacitated or unable to express themselves.