Depends on who's asking. For the Federal government, gross income is income from all sources- earned and unearned. Unearned income is your money making money- investments, dividends, capital gains, sale of property. Earned income is, well, what you actually toiled to attain, like wages, consultation fees, jury duty payment, etc.
Coronary artery calcification is the result of calcium deposition in the coronary arteries. Coronary arteries are blood vessels that deliver blood supply to the heart for its nourishment and oxygen needs.
Let me back up and explain exactly what cardiac calcification is. During the beginning stages of artery disease, the lining of aortic wall becomes inflamed, then plaque starts to build up and over time, calcium deposits begin to form in the artery wall. Those deposits are the calcification.