Note 1 to paragraph (b)(2). Neither the form of the security nor its title will determine whether a security is debt or debt-like. Instead, the substance of the obligation created by the security will be determinative.
Note 2 to paragraph (b)(2). The phrase "set amount of interest" is not intended to mean "fixed amount of interest." Floating and adjustable rate securities, as well as indexed securities, may meet the criteria specified in paragraph (b)(2)(ii) of this section as long as the payment obligation is set in the debt instrument and can be determined from objective indices or other factors that are outside the discretion of the obligor.
17 C.F.R. §210.3-10