May be referred to in ARM disclosures as "Average of Dealer Offering Rates on Nationally Traded 6-Month Certificates of Deposit Averages of Daily Figures Secondary Market Percent Per Annum." This index is defined as "An average of dealer offering rates on nationally traded certificates of deposit; annualized using a 360-day year or bank interest."
These figures are taken from the Federal Reserve Statistical Release H.15 (519), and reflect week-ending dates.
Please note: On December 16, 2013, the Federal Reserve reported that "As of the release on December 16, 2013, the H.15 has ceased publication of the 1-month, 3-month, and 6-month CD rates. Recent attrition has reduced both the number and types of institutions that provide quotes creating a challenge to construct statistically robust estimates of CD rates, and it is not feasible to resume publication."