The CUSIP number consists of a combination of nine characters, both letters and numbers, which act as a sort of DNA for the security(escrow share) - uniquely identifying the company or issuer and the type of security. The first six characters identify the issuer and are assigned in an alphabetical fashion; the seventh and eighth characters (which can be alphabetical or numerical) identify the type of issue; and the last digit is used as a check digit. Escrow markers are the generic term for you escrows or the amount you own