The state flag of Tennesee has three stars representing the "grand divisions" of the state: East, Middle, and West. The stars are "bound together in indissoluble unity by an unending white band." Officially adopted in 1905.

Tennessee's flag was designed by LeRoy Reeves of the Third Regiment, Tennessee Infantry. His explanation of the design:

"The three stars are of pure white, representing the three grand division of the state. They are bound together by the endless circle of the blue field, the symbol being three bound together in one - an indissouluble trinity. Thelarge field is crimson. The final blue bar relieves the sameness of the crimson field and prevents the flag from showing too much crimson when hanging limp. The white edgings contrast more strongly the other colors."

Source:

Tennessee State Flag: Tennessee Military Department
State Symbols: TN.gov
Tennessee Flag Illustration by Erin (public domain image)

Links:

Tennessee Flag: Michie's Legal Resources
All State Flags - National Flag