GAMMA: A measurement of how fast delta changes, given a unit change in the underlying futures price. Mathematically, gamma is the first derivative of delta and is used when trying to gauge the price of an option relative to the amount it is in or out of the money.

Generally speaking, it is any spread that theoretically profits when the market moves down. In particular it refers to a vertical spread.BETA:

GOOD-TIL-CANCELED (GTC): An order to buy or sell which remains in effect until it is either executed or canceled (although brokers usually set a limit of 30 to 60 days, after which the broker will automatically cancel it or ask the customer if he/she wants to keep it active). 

GREEKS: These are a collection of calculations which represent different characteristics of risk that a stock may exhibit, such as sensitivity to changes in price or interest rates. The measures include delta, gamma, theta, rho, and vega.

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