Okla. Stat. tit. 62, § 591

Whenever the terms "coupon bond" or "coupon bonds" appear in any statute such terms shall mean any bond, note, or other evidence of indebtedness of any public entity, department, public trust, or agency, regardless of whether such instruments are in coupon, registered, or other form. The use of the word coupon does not limit the form of instruments authorized to be issued by such entities. The use of the terms coupon or coupon rate or terms of similar import shall mean interest or interest rate on bonds regardless of the form of such bonds and shall not imply that bonds must bear coupons.