Figure 1: ECG Strip[1]
ST depression and ST elevation are forms of ST segment abnormalities caused by myocardial ischaemia or infarction. The ST segment is the section of the ECG between the end of the S-wave and the beginning of the T-wave. ST depression occurs when the ST segment is depressed in comparison to the PR segment. Specifically, the ST segment represents "the interval between ventricular depolarization and repolarization.''[2]
See ST Segment Abnormalities for Figure 2 format explanation
Figure 2: ECM Analysis, Record e0106, Lead V3[4][5] The ST segment is a darker shade of blue than the PR segment on the ECM, indicating more negative amplitude and the presence of ST depression.