We will use some of the string manipulation functions to determine the month of expiration and the strike price from an option symbol according to the following tables: Expiration Month Codes Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Calls ABCDE FGH I J K L Puts MNOPQRST UVWX Strike Price Codes (Abbr. It was less the subject matter they taught and more their high standards -- both personal and professional -- that served as role models. This instrument is supposed to reflect the vast range of actual policies used in China to extract rents from multinationals, and not just the corporate tax on multinationals.