Treasury bills (T-bills) are zero-coupon bonds that mature in one year or less. They are bought at a discount of the par value and, instead of paying a coupon interest, are eventually redeemed at that par value to create a positive yield to maturity.. Regular weekly T-bills are commonly issued with maturity dates of 4 weeks, 8 weeks, 13 weeks, 26 weeks, and 52 weeks. More @Wikipedia
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