Final answer:
The deflection in a normal ECG that represents ventricular repolarization is called the T wave, indicating when ventricles are returning to a resting state.
Step-by-step explanation:
In a normal ECG, the deflection that is generated by ventricular repolarization is called the T wave. An ECG, or electrocardiogram, records the electrical activity of the heart and delineates it into distinct parts corresponding to different phases of the heart cycle. The T wave signifies the period during which the ventricles return to their electrical resting state in preparation for the next cycle of depolarization and contraction.