Tex. Education Code § 45.201

In this subchapter:

(1) "School district" means any independent school district.

(2) "Bank" means a bank, a savings and loan association, or a savings bank organized under the laws of this state, another state, or federal law that has its main office or a branch office in this state. The term does not include any bank the deposits of which are not insured by the Federal Deposit Insurance Corporation.

(3) "Time deposit," "time certificate," "certificate of deposit," and "time deposit-open account" have the definitions adopted for those terms by the Board of Governors of the Federal Reserve System.

(4) "Approved securities" means:

(A) bonds of this state or any agency or political subdivision of this state;

(B) all evidences of indebtedness legally issued by the board of trustees of the depositing school district;

(C) all debt securities that are a direct obligation of the treasury of the United States;

(D) reducing principal balance securities, the principal and interest of which are unconditionally guaranteed or insured by, or backed by the full faith and credit of, this state or the United States or their respective agencies and instrumentalities;

(E) other obligations, the principal and interest of which are unconditionally guaranteed or insured by, or backed by the full faith and credit of, this state or the United States or their respective agencies and instrumentalities; and

(F) those securities provided for by Article 842, Revised Statutes, and Section 1, Chapter 160, General Laws, Acts of the 43rd Legislature, 1933 (Article 842a, Vernon's Texas Civil Statutes).