If your OneDrive for Business library has more than 20,000 items, you canât use the sync app as described in this article to move your files to Office 365. The item count in OneDrive for Business is comprised of files and folders in the library, plus any files in your SharePoint recycle bin.
Stock market index. A stock index or stock market index is a measurement of the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments.
What is an 'Index'. An index is an indicator or measure of something, and in finance, it typically refers to a statistical measure of change in a securities market. In the case of financial markets, stock and bond market indices consist of an imaginary portfolio of securities representing a particular market or a portion of it.