Underlying Futures Contract: The specific futures contract that is bought or sold by exercising an option.

U.S. Treasury Bill: A short-term U.S. government debt instrument with an original maturity of one year or less. Bills are sold at a discount from par with the interest earned being the difference between the face value received at maturity and the price paid.

U.S. Treasury Bond: Government-debt security with a coupon and original maturity of more than 10 years. Interest is paid semiannually.

U.S. Treasury Note: Government-debt security with a coupon and original maturity of one to 10 years.