An expanded allowable price range set during volatile markets.

During periods of great market volatility or in the case of high-risk accounts, additional margin deposited by a clearing member firm to an exchange.

See Exchange for Physical

Buying and selling puts or calls of the same expiration month but different strike prices.

A measurement of the change in price over a given period. It is often expressed as a percentage and computed as the annualized standard deviation of the percentage change in daily price.

The number of purchases or sales of a commodity futures contract made during a specific period of time, often the total transactions for one trading day.