Which of the following terms indicates a method of taking vital signs?

The term TPR stands for Temperature, Pulse, and Respiration, which are essential components of vital signs. Vital signs are critical indicators of a person’s health status and help in assessing their physiological condition. By measuring temperature, one can determine if there are any signs of fever or infection. The pulse provides information about the heart rate and rhythm, indicating cardiovascular health, while respiration rate can reveal the respiratory system's efficiency and detect potential issues like hypoxia or respiratory distress.

The other terms listed do not refer to methods of taking vital signs. RPH might refer to a related term in the context of healthcare, but it does not directly correlate with vital sign measurements. RX is a commonly used abbreviation for prescription, indicating medication but not associated with vital signs. SOB stands for shortness of breath, which is a symptom that may be assessed in relation to vital signs but does not refer to a method of measuring them. Thus, TPR is the correct answer as it directly relates to the standard practice of assessing vital signs in healthcare settings.