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The time between the onset of atrial depolarization and ventricular depolarization is referred to as the PR interval. This interval encompasses the entire conduction time from the atria to the ventricles, specifically from the P wave's beginning (indicating atrial depolarization) to the beginning of the QRS complex (indicating the start of ventricular depolarization).

Understanding the significance of the PR interval is essential in electrocardiography, as it helps assess the electrical conduction between the atria and ventricles. Prolongation or shortening of this interval can indicate various cardiac conditions, such as atrioventricular block or pre-excitation syndromes. The measurement is typically taken in milliseconds and can provide valuable insight into the patient's heart health.