Fixed interest securities are also known as fixed-income securities or simply fixed securities. These investment instruments offer a fixed rate of return to the investor, which is usually paid out in regular intervals. Some common examples of fixed interest securities include bonds, certificates of deposit (CDs), and Treasury bills. These types of investments are often considered safer than those with variable or fluctuating interest rates, as they offer a predictable source of income for the investor. Other synonyms for fixed interest securities may include fixed-income investments, debt securities, or interest-bearing securities. Whatever the term used, these investments can be an important component of a well-diversified portfolio for many investors.