debenture

In sport, a debenture is defined as a certificate of agreement of loans which is given under the company's stamp and carries an undertaking that the debenture holder will get a fixed return (fixed on the basis of interest rates) and the principal amount whenever the debenture matures. The terms may also include ancillary benefits such as an option to buy tickets at a favourable price, as well as or instead of interest. The term stems from the financial concept of a debenture.
A large number of sporting organisations have issued debentures to raise money, to allow their fans to gain a financial stake in the club, to foster a sense of community, and in some cases to fund new construction.