What are bonds called when they are issued such that a portion of the bonds mature each year over a multi-year period?

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When bonds are issued such that a portion of the bonds mature each year over a multi-year period, they are called serial bonds. This allows the bond issuer to spread out the repayment of the debt over time, rather than having to pay the entire principal amount at once when the bonds mature.

What Are Bonds Called When They Are Issued Such That