N.C. Gen. Stat. § 142-93
Special indebtedness are securities or obligations in which all of the following may invest, including capital in their control or belonging to them: public officers, agencies, and public bodies of the State and its political subdivisions; insurance companies, trust companies, investment companies, banks, savings banks, savings and loan associations, credit unions, pension or retirement funds, and other financial institutions engaged in business in the State; and executors, administrators, trustees, and other fiduciaries. Special indebtedness are securities or obligations that may properly and legally be deposited with and received by any officer or agency of the State or political subdivision of the State for any purpose for which the deposit of bonds, notes, or obligations of the State or any political subdivision of the State is now or may later be authorized by law.
N.C. Gen. Stat. § 142-93