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Definitions of the objects on this page:

• RBI: An estimate of the yield compiled by the Bond Buyer using an index of revenue bonds maturing in 30 years, with a rating equivalent to Moody's A1 and Standard and Poor's A-plus.
• BBI: An estimate of yield compiled by the Bond Buyer using an index of general obligation bonds maturing in 20 years, with a rating equivalent to Moody's Aa and Standard and Poor's AA-minus.
• 10 Year T-Note: Yields on Treasury securities at "constant maturity" are interpolated by the U.S. Treasury from the daily yield curve. This curve, which relates the yield on a security to its time to maturity, is based on the closing market bid yields on actively traded Treasury securities in the over-the-counter market.
• Month, Year, Date: The BBI, and RBI rates each come out weekly, the 10 Year T-Note is taken at market close on Thursday afternoon. The charts display the data found in the Rate Tables.