12 CFR 2013.4(b) states:
Content of account disclosures. Account disclosures shall include the following, as applicable:
(1) Rate information. (i) Annual percentage yield and interest rate. The “annual percentage yield” and the “interest rate,” using those terms, and for fixed-rate accounts the period of time the interest rate will be in effect.
With that in mind I would be cautious about abbreviating on your disclosures. Work with your vendor and possibly your regulator, if you are comfortable seeking their opinion, prior to implementation to get it right and avoid any issues down the road.