In the following symbol, the elements are the symbol root (SP), the macro (@), and the call symbol (C): SP@C If you enter this symbol, the program returns a list of all the call options on the S & P 500 Index future. To accomplish this same purpose with a stock option, you would use the same convention, i.e., IBM@C The expansion macro enables you to list all the options that satisfy a particular elements in an option symbol. The expansion macro enables you to forget about the particulars of the symbol, like the specific expiration codes and strike codes.Listing Options