Ohio’s State Flag Was Adopted In 1902 And Is The Only State Flag That Is Not Rectangular. Architect John Eisemann Designed The Ohio State Burgee (A Pennant With A Swallowtail Tip.) The “O” In The Center Of The Blue Field Is Thought To Represent Both The Name Ohio And The Buckeye. The Buckeye Is A Round Nut From The Buckeye Tree Found In Abundance In Ohio Giving It Its Nickname “The Buckeye State.” Thirteen White Stars Surround The Letter O Representing The Original Thirteen States. Four Separate Stars Sit Alone To The Rightmost Part Of Field, Representing The Four States Joining The Union After The Original Thirteen: Vermont, Kentucky, Tennessee, And Ohio. Five Red And White Stripes Complete The Ohio State Flag.