As used in this chapter:
"Issuers " means an authority as defined in rule 781-6.2 (12), the state board of regents, all political subdivisions of the state of Iowa, and any other entity which has both of the following characteristics:
"Obligations " means notes, bonds, including refunding bonds, and other evidences of indebtedness of an issuer, including but not limited to private activity bonds as defined in section 141 of the Internal Revenue Code of 1986.
Iowa Admin. Code r. 781-7.2