Yield to Maturity (YTM)
The total annual return on a bond if held until it matures.
Yield to maturity is the single rate that accounts for a bond's coupon payments plus any gain or loss between its price and face value, assuming you hold it to maturity.
When a bond trades below face value its YTM is above the coupon rate; above face value, YTM is lower. It's the standard way to compare bonds of different prices and maturities.