(a) RulemakingThe Commission shall require, by rule, each nationally recognized statistical rating organization to establish, maintain, and enforce written policies and procedures that—
(2)
clearly define and disclose the meaning of any symbol used by the nationally recognized statistical rating organization to denote a credit rating; and
(b) Rule of construction
Nothing in this section shall prohibit a nationally recognized statistical rating organization from using distinct sets of symbols to denote credit ratings for different types of securities or money market instruments.