It acts as a unique identification code for both financial and non-financial institutions. Society for Worldwide Interbank Financial Telecommunication(SWIFT) has defined standard format of Business Identifier Codes which is called as SWIFT code or BIC Code. It's also referred to as RTN,Routing Transit Number or Bank Routing Number. Routing Number is used to facilitate the electronic routing of funds (ACH transfer) from one bank account to another in USA.A Routing Number is a nine-digit numeric code printed on the bottom of checks. Routing Number/RTN/Routing Transit Number: List of STATE EMPLOYEES CREDIT UNION Branches in the City.