It is SWIFT code for US Based Citizens Bank. SWIFT code is used for the International Money Wiring.
CTZIUS33
The SWIFT BIC for RBS Citizens, NA is: CTZIUS33
CTZIUS33
CTZIUS33
according to this web page: http://www.scribd.com/doc/248842/Tuition-Payment-information-for-Babson-MBA-program it is: CTZIUS33