The flag of the state of Tennessee consists of a field of red, with a strip of blue on the fly, and three stars on a blue circle in the center. The flag was designed by Colonel LeRoy Reeves of the Tennessee National Guard. The Tennessee State Legislature officially adopted the flag on April 17, 1905.
The three stars represent the three Grand Divisions of the state: East Tennessee, Middle Tennessee, and West Tennessee. The blue circle around the stars represents the unity of the "Grand Divisions" of the state. The blue bar at the edge of the flag was purely a design consideration. When asked about the blue bar, Reeves stated that "The final blue bar relieves the sameness of the crimson field and prevents the flag from showing too much crimson when hanging limp." The National Geographic magazine erroneously reported in October 1917 that the stars represent Tennessee's status as the third state to enter the United States after the original thirteen.
Larger circle. Wider fly lines. Redesign by Rotten Ali.
Proportions similar to design by Rotten Ali. The stars represent the three geographically and legally distinct "Grand Divisions" of Tennessee (East Tennessee, Middle Tennessee, and West Tennessee). The blue circle around the stars represents the unity of those grand divisions. The orange color has become an unofficial color of the state and has replaced the blatantly Confederate origins of the red in the current flag while still maintaining the overall strong iconography of it. Posted by Preston Knapp 
Proposal for a flag for Tennessee. By Qaz Dec 2019 (details)
Part of series of designs for state flags, all in blue and white. (Posted by Ken Morton)