Final answer:
A security with a periodically adjustable interest rate is typically known as a floating rate bond.
Step-by-step explanation:
A security with a periodically adjustable interest rate is typically known as a floating rate bond. Unlike fixed-rate bonds, where the interest rate remains constant throughout the term of the bond, floating rate bonds have interest rates that are periodically adjusted based on changes in a reference interest rate, such as LIBOR (London Interbank Offered Rate) or the US Treasury rate.