Final answer:
In medical assessments, the letter "H" represents 'Head' in the secondary survey.
Step-by-step explanation:
In the context of medical assessments, the letter "H" in the secondary survey stands for Head. This part of the evaluation involves a thorough examination of the patient's head, checking for any injuries, abnormalities, or signs of illness that could affect the patient's overall condition. This assessment is crucial because head injuries or conditions can significantly impact a patient's neurological status and require prompt intervention.