Option data columns

You can customize the data that's displayed in your options window by editing the displayed columns. Default columns contain an asterisk.
Column Description 
Last Indicates the last trade price for the security.
Chg Represents the dollar change (from the previous close).
Bid The latest price offered to buy an option.   
Ask  The latest price offered to sell an option. 
Vol Indicates the number of shares or contracts traded in a security or an entire market during a given period of time. 
Open int Indicates the total number of options contracts that are not closed or delivered on a particular day.  
Chg % Represents the percentage change (from the previous close).
Bid sz Indicates the number of shares/contracts a buyer is willing to purchase at the quoted bid price.  
Ask sz Indicates the number of shares/contracts a seller is selling at a quoted ask price. 
Delta Represents the ratio comparing the change in the price of the underlying asset to the corresponding change in the price of the derivative.
Gamma Represents the rate of change for delta with respect to the underlying asset's price. 
Theta Represents a measure of the rate of decline in the value of an option due to the passage of time. 
Vega Represents the amount that the price of an option changes compared to a 1% change in volatility. 
Rho Represents the rate at which the price of a derivative changes relative to a change in the risk-free rate of interest. 
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