BP: Commonly used abbreviation for blood pressure. On a medical chart, you might see "BP90/60 T98.6 Ht60/reg R15," which signifies that the blood pressure (BP) is 90/60 mm Hg, the temperature (T) is 98.6° Fahrenheit, the heart rate (Ht) is 60 beats per minute and regular, and respirations are occurring at 15 per minute.