Glossary - V

A term to describe and quantify, the relative movement of a given market in the recent past. A market that moves a great deal is said to be volatile.
VIX a popular measure of the implied volatility of S&P 500 index options. Often referred to as the fear index or the fear gauge, it represents one measure of the market's expectation of stock market volatility over the next 30 day period.
The number of contracts made during a specified period of time as in an hour, day, week or year. For financial instruments that are traded in lots, the volume is reported to reflect that fact.