What value of the bond that is paid back at maturity is known as .?

The value of the bond that is paid back at maturity is known as the "face value" or "par value." This is the amount the bond issuer agrees to pay the bondholder at the bond's maturity date, excluding any interest payments received during the bond's life. The face value is typically set at a standard amount, such as $1,000, and serves as the basis for calculating interest payments.