For the purposes of this article, the following terms shall have the meanings respectively ascribed to them by this section:
(1) UNIT. Every county, city, town, district, or other political subdivision in the state of Alabama.
(2) OBLIGATIONS. Bonds, warrants, certificates of indebtedness, and notes of a unit, including bonds, warrants, certificates of indebtedness, and notes that are general obligations of the issuing unit and those that are payable solely from a specified source.
(3) DISTRICT ATTORNEY. The district attorney of the judicial circuit for the county or, if such has been appointed by the district attorney, an assistant district attorney who represents such county.