Yield to Maturity is sometimes referred to as “Gross Redemption Yield” or simply “Redemption Yield”.
When a Eurobond is issued the issuer will pay a coupon rate over the nominal amount of the bond. A coupon rate is similar to the interest rate a lender charges the borrower for a loan.
Coupon rates can take various shapes. This rate will not change over the life of the Eurobond unless the coupon is variable or has a complex structure.
A bond issued at 100% (par) will have a yield to maturity equal to its coupon rate. A higher price than par will mean a lower yield and vice versa.