C.R.S. § 11-55-102

As used in this article, unless the context otherwise requires: (1) “Authorized officer” means any official of this state or any of its departments, agencies, institutions, or other instrumentalities, or any of its political subdivisions, whose signature to a public security or instrument of payment is required or permitted. (2) “Facsimile signature” means a reproduction by engraving, imprinting, stamping, or other means of the manual signature of an authorized officer. (3) “Instrument of payment” means a check, draft, warrant, or order for the payment, delivery, or transfer of funds. (4) “Public security” means a bond, note, or other obligation for the payment of money, issued by this state or by any of its departments, agencies, institutions, or other instrumentalities, or by any of its political subdivisions.