An electrocardiogram (ECG) is a test which measures the electrical activity of your heart to show whether or not it is working normally. An ECG records the heartâs rhythm and activity on a moving strip of paper or a line on a screen.
The term compact is most often applied to agreements among states or between nations on matters in which they have a common concern. The Constitution contains the Compact Clause, which prohibits one state from entering into a compact with another state without the consent of Congress.
For other uses, see CD (disambiguation). Compact disc (CD) is a digital optical disc data storage format released in 1982 and co-developed by Philips and Sony. The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM).