| The routing number for the bank account also the bank code used for wire transfers. The number used to sort paper checks by bank or bank branch as well as processing electronic funds transfer. This is typically the first set of numbers/codes that appear at the lower left side of the check. Goes by various names such as American Bankers Association (ABA) Routing Transit Number (RTN) in United States; Bank Transit Number in Canada; Bank State Branch (BSB) in Australia; the Bank Branch Code in South Africa. |